No Chlorine Stability

What is floc, clarifier, stabilizer, cyanuric acid,
algaecide, brightener, dichlor, sodium hypo,
sodium bisulfate, ....??
Gullible

No Chlorine Stability

Postby Gullible » Tue 22 Mar, 2011 09:00

Pool guy,
Please do not give advice if you do not know anything. Wrong on both accounts. You making fool of yourself.


chem geek
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Pool Industry Leader
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Location: San Rafael, California

No Chlorine Stability

Postby chem geek » Tue 22 Mar, 2011 12:45

pool guy 78741 wrote:If you cyruanic acid (stabalizer) is too high (result of cal hypo tabs) or too low (result of liquid) your chlorine levels will not read correctly. A good test kit will have a test for it. If it is too high you will have to drain your pool. Too low is easy to fix just add some to the pool. Ideal levels are around 50ppm.

Cal-Hypo tabs do not increase the Cyanuric Acid (CYA) level. Instead, they increase the Calcium Hardness (CH) level. It is Trichlor and Dichlor that increase CYA. Using chlorinating liquid or bleach does not lower the CYA level -- only water dilution will do that such as from backwashing, splash-out/carry-out, intentional drain/refill, etc. Evaporation and refill will not lower CYA nor CH and can increase CH and TA from that which is in fill water. The following are chemical rules of fact that are independent of product concentration or of pool size:

For every 10 ppm Free Chlorine (FC) added by Trichlor, it also increases Cyanuric Acid (CYA) by 6 ppm.
For every 10 ppm FC added by Dichlor, it also increases CYA by 9 ppm.
For every 10 ppm FC added by Cal-Hypo, it also increases CH by at least 7 ppm.

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