I'm a bit stumped on this one and was hoping for some help. We replastered the pool and filled it about 40 days ago (just bought the house and immediately did a replaster). At that point, I added enough stabilizer to get the CYA up to 40 (per PoolMath). Two weeks later, CYA measured in at 20. Again, I added enough stabilizer to get it up to 35 or so. A week later, it measured at about 25. I added enough stabilizer to get it up to 35 again. Today it measured at a bit over 20, maybe closer to 25.
What on earth could be causing my CYA to continue dropping? We do have an automatic filler on the pool, but I rarely if ever hear it on, so I can't imagine it's auto-filling and draining the water constantly. Also had one big rainstorm which might explain one of the drops, but not all three. (Also, before anyone says I should have been targeting a CYA of 50 and not 35, I agree - I'm going to be out of town for 7 days in a couple of weeks so I was keeping the CYA lower so that I could use some pucks then and end up at a CYA I like).
Any thoughts what might be going on? I thought CYA could only go down if water were rained and refilled. Thanks for any help.
What on earth could be causing my CYA to continue dropping? We do have an automatic filler on the pool, but I rarely if ever hear it on, so I can't imagine it's auto-filling and draining the water constantly. Also had one big rainstorm which might explain one of the drops, but not all three. (Also, before anyone says I should have been targeting a CYA of 50 and not 35, I agree - I'm going to be out of town for 7 days in a couple of weeks so I was keeping the CYA lower so that I could use some pucks then and end up at a CYA I like).
Any thoughts what might be going on? I thought CYA could only go down if water were rained and refilled. Thanks for any help.