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As an immediate example of this need, a Water Testing Blog reader named John recently asked,
“Hi, I am installing a 5000 litre water tank which i intend to add chlorine to and need an inexpensive free chlorine meter could you advise me on what to purchase as this is a new venture for me. Regards, John M.”
Thank you, John, for your question. We will begin by saying that you should immediately narrow your search by eliminating any water quality testing meters not using a form of DPD-1 as the reagent for free chlorine testing.
While ORP meters do offer a good bit of utility, their readings do not directly monitor just free chlorine content of water and a great number of water quality purists still feel that traditional DPD chemistry provides the best means of determining a sample’s relative safety — based solely upon the sample’s chlorine concentration, of course.
With that said, DPD comes in several forms: Liquids, Powders, Tablets, and ReagentStrips.
To answer John’s question directly, though, we suggest that he take a look at the eXact Micro 7+ Water Testing Meter. It offers quality chlorine testing capabilities and the option of testing for a host of other parameters, as well — if desired.
The basic test kit includes…
What sort of detection range does the meter have? So glad you asked!
Naturally you will want to, or you should want to, know about the cost of replacement reagent(strips) for the meter. Since John asked about chlorine testing, below you will find links to, and pricing for, replacement DPD-1 and DPD-3 ReagentStrips — currently available at several online locations such as FiltersFast.Com and FilterWater.Com.
* Free Chlorine ReagentStrips 486637 — DPD-1. Used to test for free chlorine residuals. Around $13. * Total Chlorine Test Strips 486670 — DPD-4. Used to test for total chlorine, but does NOT require the use of DPD-1 first, unlike the DPD-3 reagentstrips that come with the basic kit. Around $14 for 100 tests. |
* ITS-EZ7-486637 — DPD-1 used for free chlorine testing. Around $13 for 100 tests. * ITS-EZ7-486638 — DPD-3 used for free chlorine testing. Requires use of DPD-1 first. Around $8 for 100 tests. |
So if you find yourself in the market for a chlorine testing meter that uses an EPA Compliant testing method AND offers additional testing capabilities, definitely take a look at the line of eXact Micro 7+ Meters.
]]>We recently learned that the maker of SenSafe Water Test Kits has released a new version of the eXact Micro Meter Water Testing Kit that makes accurate chlorine testing with DPD-based chemistry easy for experienced testers and novices alike.
Introducing, for all your chlorine testing needs, the eXact Chlorine Photometer… a digital meter for testing chlorine that has a detection range of 0 to 11 parts per million for both free and total chlorine without the need for drop counting, crushing tablets or dissolving powders.
Using the same hardware platform as the eXact Micro 7+ Meter, this new kit comes with 100 tests for free chlorine (using DPD-1) and 100 tests for total chlorine (using DPD-4)
Aside from the 0.01 ppm resolution with +/- 0.02 ppm accuracy between 0.00 and 2.39 ppm chlorine and its high detection limit of 11 parts per million, the eXact Chlorine Photometer also offers a great deal of versatility for those who may want to test for other water quality parameters such as… Ammonia, Bromine, Chloride/Salt, Chlorine Dioxide, Chromium (in Hexavalent Form), Copper, Cyanuric Acid, Fluoride, Iodine, Iron, Low Range Total Hardness, Manganese, Nitrate, Nitrite, Ozone, Acid pH, Alkali pH, Potassium, Sulfate, Sulfide, and Turbidity.
If the need arises where you need, or want, to test for parameters other than free and total chlorine, simply pick up a bottle of the appropriate reagentstrip and follow the simple instructions in your meter’s manual.