Re: CYA disappeared over winter?
When a pool is "let go" over the winter with no chlorine in it, then bacteria can grow and convert CYA into carbon dioxide and either ammonia (if you're unlucky) or nitrogen gas (if you're lucky). So first see if the chlorine holds. If instead it gets almost immediately consumed and you measure CC instead of FC, then you have ammonia and that can take a LOT of chlorine to get rid of. You can get an ammonia test kit to find out how much where you'll need at least 8-10x the ammonia level as FC to get rid of it. If instead you measure FC and not CC, then yes you can see how quickly the FC drops. If in full sun it drops about in half every hour, then you have no CYA in the water. If the FC holds in sunlight, then your test kit may have gone bad though that's unlikely since melamine which is in the kit doesn't degrade very quickly.
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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