Re: Very Interesting Problem
WHOOPS!!!! This math is all wrong! 1 gallon of 12.5% chlorine will raise 1,000 gallons of water to 125ppm! 'Way, WAY too high. Lost a zero somewhere. It will raise 10,000 gallons to 12.5ppm, rather than 10ppm, assuming, of course, that the 12.5% didn't break down to 10% (which is likely). If it has broken down to 10%, then, of course, it will only add 10ppm, not 12.5Originally Posted by waterbear
Waterbear is using his language very, very precisely (Test strips, although they do give accurate results, do NOT have the precision (resoluton) to base water chemisty adjustments on! For example, how can you ajust pH when all you know is that the pH is somehwere between 7.2 and 7.8 which is what the majority of strips will tell you?) here. It is extremely easy to get spurious results with most test strips. If you run the test even slightly wrong, or there's the tiniest contamination on the strip, you'll get bad readings.
Other than that, I sure appreciate Waterbear doing my job so I don't have to!Pools with very high TDS from old water that have been using stabilized chlorine will also have very high CYA levels. The problem is NOT from the high TDS but from the high CYA. Both readings go up when the water is old. If high TDS had an effect then every pool on a SWG would be in trouble since their TDS is going to be higher than their salt reading and well above what is considered to be too high (even in new pools), which is a part of the measured TDS! Obviously, this is not the case.
The accepted cure for high TDS is to drain and refill, exactly the same as for too high a CYA reading! Which is the culprit, TDS or CYA? I put my money on CYA every time!
IF you want to make your customers happy invest in one of the water labs available to the industry from companies like Tayor or LaMotte and stop using the strips so you can accurately diagnose what is going on in their pools!
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