New pool in May. Mistakenly listened to local Pool Supplier clerks and was using tri-chlor floater with di-chlor for shocking. All that ,after pool install instructions advised me to add 1 LB "stabilizer" in skimmer at start-up. Water looked good for 6 weeks until it rained. Since then, I began fighting algae.
Chems were FC:5, TA:5, CH:220, CYA:50, pH 7.6 so after two rounds of fighting algae in two weeks, I decided to dump over half the pool to get CYA to 30 to allow better chance to fight algae with affordable oxidizer level. Refilled, but failed to remove the floater containing 2 tablets of Trichlor and again mistakenly started with 1.5 lb di-chlor resulting in CYA of 90 CYA! It nearly doubled after diluting with ~7000 gallons of puclic well water! Now CYA:90, pH: 7.4 TA: 110, FC: recently dropped to 4, CH:200 87 degree water surrounded by no less than 50 trees in the back yard.
Two problems to address: CYA and Algae.
1) CYA: Most importantly where did that level come from? I have multiple consistent readings before and after so seems to pass measurement system analysis. Was it stuck in filter. I drained pool directly to waste via bottom drain. If I dump it again and remove all stabilzed chlorine sources, I fear what may result.
2) Algae: Pump runs 24/7. I think it is mustard as it is just barely brownish near center drain at bottom, which is always on. It sweeps away easy. Pool looks barely cloudy. I do not want to use 12-13 bottles of bleach to shock it and then many more each week. So after 2nd refill in a week, theory is I could oxidize to 60% of resulting CYA level for a couple of days.
How far off is my thinking? BTW, we are all septic systems here so water has no additional fees. Tends to be cheap although I still think wasteful to repeatedly dump it.
CYA: considering dumping majority of pool to get rid of it and begin using bleach. But most importantly, I cannot understand how this level increased so drastically. Was i