Every year since we started this project we received numerous emails asking us how often pool water should get tested… and every year we respond to each inquiry because we believe pool owners could save themselves a lot of headaches and money by testing their water on a regular basis.

Basic Chlorine & pH Test Kit
Basic pH & Cl Test Kit
– Quickly test for total chlorine and pH with this simple, inexpensive test kit…

Basic 3 Way Pool Test Strip
Basic 3-Way Test Strip
– Fast and inexpensive way to test for free chlorine, pH and alkalinity…

4 Way Pool Test Strip w/ CyA Test
Pool Test Strip w/ CyA
– This easy-to-use, affordable 4-way pool test strip reads for alkalinity, free chlorine, pH, and cyanuric acid…

Pool Check 6-Way Test Strip
Pool Check 6-Way
– Definitely a must-have for pool owners who want a thorough, accurate pool test w/o the hassle of taking water to a store or messing around with a full-blown ‘wet’ chemistry pool kit…

What do you mean by ‘regular basis’?

We will address this question first by giving a list of definite reasons to test one’s pool water:

  • Brand New Pool – Better to run a full battery of tests that includes things like dissolved metals in your source water and remove any you find or risk having those metals come out of solution and stain your brand new pool when you add chlorine/bromine. Also, you will want to know exactly what to add (i.e. pH adjuster, alkalinity adjuster, hardness, etc.)
  • Opening Your Pool – After adding source water, and before adding chemicals, test the water to make sure you have no dissolved metals and also so that you do not add other pool chemicals (i.e pH, alkalinity, hardness, etc.) unnecessarily.
  • After a Natural Event – Test your water for the basics (i.e. sanitizer level, pH, alkalinity, hardness, etc.) after periods of heavy rain, heavy winds, etc.
  • When Nature Calls – Should you ever realize that someone has taken a ‘phone call from Nature’ in your pool, get everyone out and follow suggested pool shocking practices which usually require maintaining sanitizer levels at or above a certain level for a specified period of time before allowing anyone back into the water.

    You will need to test for those elevated sanitizer levels in order to know that you have followed the procedure… and then you will need to test to make sure those have sufficiently decreased before allowing bathers to re-enter the water.

  • In the Event of Algae and/or Cloudy Water – If either of these two pool water conditions afflicts your pool then you should certainly test the water to find the problem, obtain the correct chemicals to correct the problem, and test to make corrected the problem.
  • After the Crowd Has Left – The larger the bather load, the greater the likelihood of a shift in a pool water chemistry balance. Suntan oils, sweat, and, um undetected ‘liquid accidents’ all have an effect on the water’s pH, alkalinity and sanitizer levels
  • Closing Your Pool – Always test the water and correct any problems with the water before closing the pool because water problems that exist at the end of the season will only get worse when the pool sits idle over the Winter months.

Getting to the actual question in the title of this article, though, we suggest testing the water as often as you can. In all honesty, with the correct pool water testing product, taking a quick snapshot of your pool’s water quality ought not take more than about a minute.

Pentair pH & OTO Liquid Test Kit Reagents
pH & OTO Test Kit Reagents
– We suggest replacing last year’s liquid test kit reagents with new ones because once opened, they ‘spoil’ rapidly…

We suggest daily pool testing, but let’s face it… kids, school, work, chasing the neighbor’s cat out of the yard, and darn near 1 million other things rob most of us of any remaining, few, and precious seconds of ‘free’ time as it is — so how about testing each time you go out to check the skimmer?

Or, for those with automatic chlorine or bromine feeders (very useful gadgets, by the way!), how about every time you go poolside to fill up your feeder?

In the end, though, just like the owners of private water wells, no government agent will come out and make you test the quality of your water. Therefore, it becomes a personal choice as to whether or not a pool owner wants to test regularly and potentially stop pool water problems before they get out of hand (cloudy water, algae, bacteria, parasites, etc.) … or spend money to correct each of those problems after they occur.

Economics of pool water testing?

A bottle of Pool Check 6-Way Test Strips costs around $12 and provides 50 fairly comprehensive pool tests… with each test taking a bout a minute.

On the other hand, not testing a pool regularly can result in a pool owner having to spend an estimated $4 to $6 per 10,000 gallons of pool water for shock (liquid or powdered), no less than $5 or $6 for a gallon of standard algaecide ($20+ for the concentrated stuff!), and in really bad cases… $20+ per quart for stain remover.

Did we mention that correcting pool water problems usually also involves time spent brushing down walls, backwashing (and possibly having to acid wash) filters clogged with algae, and getting a real workout scrubbing stains off of pool surfaces?

And in conclusion…

You do the math on whether or not regular pool water testing makes sense.

For more information on pool water testing, please check out the pool water section/category of this site.

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