Re: PolyQuat and Shocking with Chlorine
Originally Posted by
chem geek
The fact that users see chlorine levels drop rather precipitously while the CC only goes up a relatively small amount probably means one of the following:
1) PolyQuat consumes (combines with) chlorine to perform some sort of chlorinated PolyQuat, but does not show up completely in the CC (TC) test.
2) High levels of chlorine oxidize PolyQuat (i.e. break it down) which would explain the large drop in FC while CC doesn't climb very much. If this is the case, then it doesn't make much sense to close the pool with PolyQuat. Perhaps it's OK to use PolyQuat first, at lower chlorine levels, and then later (perhaps a few days or a week later) shock the pool with chlorine. I did read that it is recommended not to shock the pool within 48 hours of using PolyQuat.
3) High levels of PolyQuat interfere with the FC test so that the chlorine level is still high but one does not know it from the test.
If I were a betting man, I'd bet that #2 is what is going on.
Richard
So where do we go from here? I started with 5.0ppm FC and within 48 hours I was down to 2.8ppm. The PolyQuat dose was a start-up dose (Clean Pool) of 1oz per 1000 gal H2O. The question is since the Chlorine went down and has been restored ---- is there any Quat left??
Is there a way to test to see if there is PolyQuat remaining? At $75.00 per gallon for 60% PolyQuat, it would be nice to know what’s happening.
27038 Gallon InGround, Vinyl, DE filter.
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