Water Quality: Testing, Filters for, and Purification of Drinking, Ground and Pool Water » Chlorine

Liquid Reagent Turns Yellow in Presence of Chlorine

Water Testing Blog — Tue, 31 Jan 2012 13:03:15 +0000

Today’s inquiry came to us from ‘Kishore’ who asked a question about a liquid test reagent that turned yellow when added to a sample of water containing chlorine-based water disinfection tablets.

Dear Sir, I mixed chlorine tablets(water purification Tablets) in water. my friend taken water in Test tube. mixed one drop of liquid then water color changed in yellow. what is name of that liquid. how to by that.please can sent details.

Hello, Kishore, and thank you for the inquiry about a liquid test reagent that turns yellow in the presence of chlorine. Based upon your description we suspect your friend used a chemical called ‘OTO’ to perform the testing. OTO stands for Orthotolidine dihydrochloride. It test for total chlorine (free chlorine plus combined chlorine collectively).

Pool Test Kit for Total Chlorine & pH
Using OTO and Phenol Red

You can find OTO in most pool supply stores, as it normally comes in the more basic pool water testing kits for total chlorine and pH, the two most commonly tested pool water quality parameters.

Many companies also sell the two reagents separately since they do tend to ‘go bad’ after a year once opened and exposed to air.

If you want to perform more precise chlorine concentration testing for free chlorine, the compound most people have the most interest in (usually) when attempting to determine if water has had the proper amount of disinfectant added to it, you will want to invest in a drinking water test kit that uses DPD-based reagents. ( What is DPD? )

For an even simpler means of testing the chlorine levels in water samples you may want to consider a product such as the SenSafe Free Chlorine Water Check, an EPA Approved method for determining free chlorine concentrations in drinking water, or the WaterWorks 2 Free & Total Chlorine product that uses the same free chlorine testing method as the SenSafe Free Chlorine Water Check and also includes a separate test area for total chlorine.

Want to know more about the differences between free and total chlorine? Check out an article called Free Chlorine, Combined Chlorine, Total Chlorine.

One more thing about OTO before we go: We have heard that some countries have outlawed its use due to scientists having evidence that it may cause cancer in humans… so check local laws before making a purchase!

We hope this helps!

How Can I Check to See if My Water Filter is Working?

Water Testing Blog — Sun, 02 Oct 2011 13:33:38 +0000

Anyone that has taken the initiative to install a water filter or water purification device/system in their home deserves a bit of praise… and those that continue to take an interest in the quality of their water after installing a water treatment system deserve even MORE for their efforts.

As an example, ‘J. Mampilly’ from India installed a system and now seeks to determine if he has installed the correct unit. He asked,

I would like to know about how i can confirm the effectiveness of my water purifier. Labs in India that can certify and throw light on the camparative quality of water before and after using a water purifier. Thank You

Unfortunately we do not have familiarity with water testing laboratories in India and cannot directly assist with this situation. We can suggest, however, that you contact your local health department and ask them for a list of certified water testing laboratories in your area.

Coliform Bacteria Test Kit

Before…

In order to know what type of filter or what filtering capabilities you should purchase, invest (yes, we said invest) in a thorough water analysis performed by a qualified water testing laboratory. Here, again, we suggest contacting your local board of health and asking them, for a list of certified drinking water testing labs. Alternatively, or if no labs exist in your immediate vicinity, you can use the services of accredited water testing companies such as National Testing Labs.

No matter what, though, always have your water tested BEFORE deciding on a water treatment system. Oh, and one more thing: Don’t think for one second that a salesperson doing an in-home water test has the same water testing tools or qualifications as a reputable water testing laboratory. Remember: 99% of all salespeople attempt to sell things and not accurately analyze a situation — especially if accurately diagnosing a situation could cost them a sale!

Simple Test Kit for
Total Dissolved Solids

And after!

As ‘J. Mampilly’ has done, we should ALL take an interest in comparing the quality of water that comes out of our water filter systems. Only then will we know if the money we invested in (not spent on!) a quality drinking water filter system performs as expected.

Testing water quality beforehand gives us not only an idea of what we need to filter out of our water, but also a checklist of water quality parameters to monitor post-filtration. Should follow up water testing reveal that these ‘issues’ did not get corrected or suddenly show up months after the installation of a water system, perhaps the water filter has stopped working or never really worked properly in the first place and needs service of some sort.

And in conclusion…

Many people go through life ‘deaf, dumb and blind’ when it comes to the quality of their water — until an (initially) unexplainable health problem pops into their life. Then, and unfortunately sometimes too late, those same people get very interested in the quality of their water and want to punish or otherwise penalize others for allowing them to consume tainted, polluted and/or contaminated drinking water.

Although we feel much sympathy for the victims of poor quality drinking water, most of us here in the United States have the ability to at least once every great while perform basic testing for critical water quality parameters such as heavy metals (i.e. lead, mercury, copper, iron, etc.), coliform bacteria, pesticides (i.e. atrazine and simazine), chlorine levels (free and/or total), total hardness, total dissolved solids, and many others.

Many times the contaminants in a water supply will have no taste, carry no odor and not appear before the naked eye. Only testing will alert you to their presence.

Emergency Water Purification Method

Water Testing Blog — Tue, 30 Aug 2011 02:26:02 +0000

WARNING: We provide the following emergency water purification method for use strictly as a general guide and not as a guaranteed method for manufacturing safe, clean drinking water. Every emergency situation has different factors these instructions do not take into account. We make no guarantee that these instructions will work in all situations.

With that out of the way, please remember that the best preparation for an emergency begins long before the event takes or looms on the immediate horizon. Properly planning and preparing by stockpiling clean drinking water, emergency rations, candles, a radio that receives NOAA broadcasts, weather resistant gear, waterproof matches, a tarp, blankets, medical supplies, a supply unscented chlorine bleach, etc. can lessen the immediate sting of a short-term emergency and make surviving longer emergencies more likely.

1. After collecting the water in a container, let any suspended particles settle to the bottom and gently pour the clear water off the top into a second container. Filter this water using a clean piece of cloth or coffee filter to remove any remaining particles.

2. To disinfect by boiling, bring the water to a rolling boil and boil for a least 1 minute. Boil longer at high attitudes or if the water is from a source suspected to have Giardia or other protozoa (5 minutes boiling time is recommended at 10,000 feet above sea level). Boiling will kill disease-causing microorganisms present in water, but will concentrate non-volatile chemical contaminates, so it is unwise to boil for longer than necessary.

3. Let the water cool at least 30 minutes. You can re-oxygenate the water by pouring the water back and forth between two clean containers. This will improve the taste.

4. To disinfect by chlorination, use ordinary household chlorine bleach. Sodium hypochlorite with a concentration of 5.25% to 6% should be the only active ingredient in the bleach. There should not be any added soap or fragrances. One major bleach manufacturer has also added sodium hydroxide as an active ingredient, which will not pose a health risk for water treatment. Add 16 drops (¼ teaspoon) of liquid chlorine bleach per gallon of water, or 8 drops per 2-liter bottle of water. Stir to mix. If you do not have a dropper, use the following (instructions) to measure the correct amount of bleach.

8 drops = 1/8 teaspoon, 16 drops = 1/4 teaspoon and 32 drops = 1/2 teaspoon.

5. Let the water stand 30 minutes to give the chlorine time to kill the microorganisms present. This method is not guaranteed to be effective against certain encysted protozoa.

6. If it smells of chlorine, you can use it. If it does not smell of chlorine, add 16 more drops of chlorine bleach per gallon of water (or 8 drops per 2-liter bottle of water), stir, let it stand 30 minutes, and smell it again. If it smells of chlorine, you can use it. If it does not smell of chlorine, discard it and find another source of water. The only agent used to purify water should be household liquid bleach. Other chemicals, such as iodine or water treatment products sold in camping or surplus stores that do not contain 5.25 percent sodium hypochlorite are not recommended.

7. If the chlorine taste in the water is too strong after disinfection, pour it from one clean container to another several times. This will drive some of the chlorine off as a gas, lowering the level of chlorine in the water and improving the taste.

Source: Emergency Water Supplies and Treatment (Fact Sheet No. 6.704 by R. Waskom)

Not to sound like a broken record, but the creators of the instructions above (and ANY instructions you read on the internet or in books/magazines) could not possibly know the exact specifics of every situation where a person or group needs to create safe drinking water. Nor could they know the full list of contaminants one might find in their source water. Use the above instructions as a general guide only.

Katadyn Drip Ceradyn (Gravity Container) System">
Katadyn Drip Ceradyn
(Gravity Container) System

Katadyn Siphon Filter
Requires No Pumping

Katadyn KFT Expedition
Water Filtration System

Chlorine Not Staying in Pool Water?

Water Testing Blog — Tue, 23 Aug 2011 17:10:04 +0000

Earlier this Summer we discussed this same topic and we feel quite certain that we will discuss it many more times in the future. Today’s inquiry comes to us from ‘JerseyGuy82560′ who asked,

Sas your answer regarding chlorine not lasting long with the answer being that liquid chlorine without a stablizer was probably the problem. I’m using powdered shock and put 2 pounds in last night at 10 PM. This morning at 6 AM, there was just a trace of chlorine. I don’t want to empty the pool in the middle of the season, so can I use conditioner to make the chlorine last longer? Thank you.

Thank you for your question, JerseyGuy. Many of the powdered (also called granular) shocks on the market have calcium as their base and do not possess stabilizer. For that reason the situation you described where 2 pounds of shock literally vanished overnight makes sense… providing you have not added chlorine stabilizer to the water at some point.

Chlorine Stabilizer Powder
AKA: Cyanuric Acid

If you have not added any stabilizer (cyanuric acid) this year, then certainly putting some in now should help you maintain a healthy chlorine residual in your pool water.

If, on the other hand, you have added chlorine stabilizer and still cannot maintain a healthy chlorine level, you either have an abundance of contaminants in the water that require your chlorine’s immediate attention or you may not have enough chlorine stabilizer in the water.

Testing for Chlorine Stabilizer?

Several different test methods for cyanuric acid exist: 1) Wet Kits; 2) Test Strips; 3) Water Testing Meters.

Wet Kits for Stabilizer Testing: Test kits of this nature use a chemical reagent that reacts with chlorine stabilizer to create a white substance in test samples which makes the water turbid and difficult to see through. Analysts then measure chlorine stabilizer levels as a function of turbidity.
Test Strips for Stabilizer Testing: Test kits of this sort use a small piece of chemically impregnated cloth which changes color in the presence of cyanuric acid. Analysts then measure chlorine stabilizer levels as a function of change in color.
Meters for Stabilizer Testing: These devices typically use the same principles as wet kits for determining cyanuric acid levels in pool water samples except the meter interprets turbidity levels instead of analysts taking the measurements. Given the very subjective nature of quantifying turbidity in a sample, meters generally tend to give more accurate and repeatable results.

So, JerseyGuy, if you have clear water at this time and still cannot maintain a proper chlorine residual, first we suggest determining if you have any stabilizer already in your water. Then we suggest bringing the level up to around 30 or 40 parts per million.

We hope this helps!

Cyanuric Acid Test Kit

6 Way Test Strip w/ Cyanuric Acid Test

eXact Pool Testing Meter

Free Chlorine Levels in Irrigation Water

Water Testing Blog — Tue, 26 Jul 2011 02:01:08 +0000

Today’s question comes from ‘Mohamed’ who asked, “How much should be the free chlorine in the irrigation water? We are treating sewage water and sending it to farm lands. What is the international standard of the irrigation water in respect to free chlorine?”

WaterWorks 2 Free & Total Chlorine Test Kit

We do not know of an International Standard for free chlorine levels in irrigation water but we do know that most States in the US require wastewater treatment plants to neutralize TOTAL chlorine levels before discharging water into the environment and that wastewater treatment facilities must test for total chlorine residuals in their effluent streams on a regular basis to make sure the chlorine concentrations stay virtually non-existent.

Why worry about chlorine in the environment?

If allowed to enter the environment chlorine can and will effectively kill or damage biological organisms that it comes in contact with. In great enough concentrations chlorine will wipe out all plant life in a body of water as well as any animals or fish in the water.

We use chlorine to render safe (i.e. KILL) biological contaminants in our drinking water and if released into a natural habitat the chlorine will render safe (i.e. KILL) any and all plant an animal life until it loses its effectiveness.

Testing for free & total chlorine?

Whether you prefer test strips, wet chemistry kits or a water testing meter… you have plenty of choices when it comes to testing for both free and total chlorine levels in drinking and treated waste water.

eXact Chlorine Photometer

EPA Approved Free Chlorine Test

Taylor Fas – Dpd Titration

Filter to Remove Chloramines

Water Testing Blog — Fri, 22 Jul 2011 13:03:09 +0000

Do not let a clever sales pitch or catchy marketing jingle fool you. Many common drinking water filter systems do NOTHING to remove or reduce chloramines in water. They simply lack the technology in their filtration media to do so.

We mentioned this filter (the Pentek ChlorPlus) in the past and now feel the need to mention it again since we continue to receive inquiries from people asking why their water filters fail to remove all of the chlorine smell from their water.

The majority of water filters readily available in the marketplace do NOT remove chloramines, also known as combined chlorine. Most carbon filters remove free chlorine only. It takes a specialized type of filter like the Pentek ChlorPlus to cleanse water of unwanted chloramines.

Does my water contain chloramines?

Whether your municipal water system uses free chlorine or chloramines as its primary sanitizing agent we cannot say, but in either case your water will certainly contain chloramines. Unsure why? Take a look at this brief tutorial on free chlorine, total chlorine and combined chlorine.

That’s just a cartridge… What sort of housing does it go in?

A very keen observation followed by a very good question! The Pentek ChlorPlus filter for chloramine removal fits in most standard sized 10″ (by 2.5″) filter housings including, but not limited to, models manufactured by companies like Pentek, Ametek, US Filter, Bruner, American Plumber, Cuno, Filterite, Keystone, Water Resources and most Harmsco filter housings.

As always before purchasing a replacement cartridge for your water filter system, check, double check and TRIPLE check to make sure your housing will accommodate the filter cartridge you wish to buy!

Chlorine Taste in Refrigerator Water

Water Testing Blog — Sat, 02 Jul 2011 13:03:59 +0000

For the sake of argument we will assume you have installed some sort of filter on your kitchen sink… and it works perfectly fine for the times when you want water that contains no chlorine taste or smell in cooking water. But what if you want a glass of ice cold water straight from that fancy water dispenser on the front of your refrigerator? What then?

Easy Install Refrigerator Filter

Do they make filters for the water passing through refrigerators? As a matter of fact, yes, they do.

Specifically, we know that a company called Crystal Quest makes an inline refrigerator filter that uses 4 stages of filtration including “post 5-micron filtration for bacteria, rust and sediment removal”, “KDF filtration for 99%+ chlorine removal”, and granulated activated carbon filtration for the removal/reduction of a wide range of organic contaminants, chemicals, pesticides, VOCs (volatile organic chemicals), bad taste, and odor.

Conveniently hooking up to pretty much any standard refrigerator water line, the Crystal Quest Refrigerator Filter makes an excellent addition to any household that wants to have clean tasting water dispensed from its refrigerator cold water tap.

As an added bonus, since this filter hooks in on the intake for the whole refrigerator, ice makers also will produce water using filtered water… meaning ice cubes should taste better, too!

Interested in improving the taste of water going into coffee makers, water coolers and/or drinking fountains? This in-line refrigerator water filter can also can be used on water fountains, water coolers and coffee makers.

How long will this filter last? A very good question! With normal water (i.e. typical municipal water) Crystal Quest says the unit will last for up to 6,00 gallons.

Chlorine Testing Meter for Swimming Pool?

Water Testing Blog — Fri, 01 Jul 2011 13:03:03 +0000

As we expected, the number of questions we received recently about swimming pool water has definitely increased. Today’s inquiry comes from a Water Testing Blog reader who hails from Pakistan and he/she asked:

Dear Sir/Madam,
hope you will be fine.i need some information regarding digital chlorine tester for swimming pool water .i read about extech cl200 testing metre.kindly send me the literature and price for it .
thanks
an early response is appreciable
farhan

Now before any of you go and criticize this person’s grammatical skills when typing in English, think more about the person’s commitment to keeping a proper chlorine level in swimming pool and the time it took to submit a question to this site.

ExTech CL200 Total Chlorine
Testing Meter for Water

ExTech CL203 Total Chlorine
Test Reagent Tablets

WE commend ‘Farhan’ for his/her efforts and for transcending the language barrier to ask a question about proper chlorine testing in pool water.

On the topic of the “Extech 1200C” for chlorine testing in pool water, we took a look at the ExTech web site and did not find a meter in the chlorine/fluoride in water detection called the ‘Extech 1200C’… so we found ourselves a bit puzzled by your question.

We DID, however, see the ExTech CL200 Chlorine Testing Meter which uses Extech (CL203) Exstik ExTab™ Chlorine Reagent Tablets, a undoubtedly a proprietary blend of DPD-1 & DPD-3 reagents, to test for ONLY total chlorine concentrations in water.

The obvious problem we see with this meter for pool water testing, despite its USEPA credentials for total chlorine testing (in waste water), deal with the meter’s INability to test for free chlorine concentrations in water.

Proper Pool Water Testing Requires Free AND Total Chlorine Testing!

That heading said it all. Proper pool water care requires both free AND total chlorine testing.

Why? Quite simply, it does little good for the sanitation of a pool to have an in-range total chlorine reading with a very low, or non-existent, free chlorine reading. When that happens the pool contains mostly, if not entirely, chloramines (aka: combined/used chlorine molecules) which possess very little (limited) oxidizing power… and limited oxidizing power means limited sanitizing capabilities.

Improperly sanitized pool water can EASILY become a home in which various bacteria, parasites and viral ‘issues’ which will flourish, breed and infect swimmers if left unchecked.

Repeated Moral of the Story

Invest in a meter that test for both total chlorine concentrations AND free chlorine concentrations.

We suggest using a meter like the eXact Micro 7+ Pool & Spa Meter because it tests for not only free AND total chlorine, but also for Total Alkalinity, Bromine, Calcium Hardness, Copper, Ozone, Permanganate, and pH… all with the same meter!

Earlier we talked about the Extech’s USEPA credentials so naturally we figure you want to know if the eXact Micro 7+ Meter has credentials, too — and it does! When used with DPD chemistry (and the appropriate procedures, of course) the meter qualifies as an EPA Compliant device for testing free an total chlorine in drinking water.

“But Wait! There’s More!” Screamed the Announcer

As an added bonus, the eXact Micro 7+ Pool Meter also has the ability to test for Ammonia, Chloride/Salt, Chlorine Dioxide, Chromium Hexavalent, Cyanuric Acid, Iodine, Iron, Low Range Total Hardness, Manganese, Nitrate, Nitrite, Acid pH, Alkali pH, Potassium, Sulfate, Sulfide, and Turbidity — when operated in ‘% Transmission’ mode with the appropriate eXact Micro 7+ Reagent Strips.

eXact Micro 7+ Pool Testing Meter

eXact Micro 7+ ReagentStrips

Question: Why is My Lawn Yellow?

Water Testing Blog — Wed, 15 Jun 2011 01:01:12 +0000

Today’s question comes from a woman in Illinois named ‘Gretchen246′ who asked a very interesting question… about her lawn.

“Why is my lawn green? A healthy lawn is the sign of a healthy home and my lawn is yellow. Allthe lawns here are yellow and we all fertilize and feed and do all we’resupposed to but the lawns are still yellow. Could it be the water?”

Sad to say, but the little kid in us wants to say, ” Gretchen, your neighborhood needs a leash law to keep wandering dogs from peeing all over your lawns!” Ha ha. Yep. The kid in us has not, yet, grown up all the way… and we hope it never does!

On a more serious note, if every lawn in your neighborhood has the same issue (bad grass), then it stands to reason that all of your lawns have at least SOMEthing in common. Typically all yards in a development will share a similar soil type (i.e. composition, pH, etc.), environmental conditions (rainfall, amount of sunlight, etc.) and quality of water used to keep them hydrated.

Since we know very little about soil we will pass on the opportunity to discuss that topic and move in for the kill on a topic we DO know something about: Water. Since you say your lawns stay yellow, a sure sign of a dead or dying lawn, perhaps your lawns don’t particularly care for something in the water?

As our first guess, we cast our vote for chlorine. Most municipal water systems use a form of chlorine to keep biological contaminants from growing in the water and water lines. Once out of the water line, however, chlorine will continue to wage war on biological organism… like the grass in your lawn.

Chlorine in my water?

How do you know if your tap water contains chlorine? Perform a simple test for chlorine using a product such as the WaterWorks 2 Free & Total Chlorine Test Strip. We like this product because it provides reliable test results for both free and total chlorine concentrations in water at the same time and in just a few minutes.

There’s chlorine in my water… Now what?

Well if the chlorine poses a problem (i.e. it kills your grass!) then we heartily suggest removing it from the water you use on your lawn. The products below from Gar’n'Gro should have the ability to help with that task.

Gard’n'Gro Chlorine Removal Filter	Pre-Filter for Gard’n'Gro Filter
Replacement Gard’n'Gro Chlorine Filter	Replacement Gard’n'Gro Pre-Filter

For those interesting removing chlorine from their drinking water, you may want to consider installing a simple, yet effective, faucet filter such as the Crystal Quest W2 in your kitchen.