Re: Buying big bucket of CYA or just as much as you need.
The chlorine degradation rate of CYA is slow. At normal pool levels, it's roughly 2-3 ppm CYA per month while in hotter spas it's around 5 ppm CYA per month. At shock levels it is no doubt higher, but one is usually not shocking their pool for very long. I don't think it's a very practical way to lower the CYA.
As for the bacterial degradation, you can either end up with ammonia and have a huge chlorine demand or you can end up with nitrogen gas and not have extra demand. Which occurs depends on the conditions that to get nitrogen gas require two different types of bacteria. Maybe there's a way for the ammonia to outgas or otherwise get removed (other than from the second type of bacteria), but I'm not aware of any such mechanisms.
15.5'x32' rectangle 16K gal IG concrete pool; 12.5% chlorinating liquid by hand; Jandy CL340 cartridge filter; Pentair Intelliflo VF pump; 8hrs; Taylor K-2006 and TFTestkits TF-100; utility water; summer: automatic; winter: automatic; ; PF:7.5
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