Friday I drained and replaced 12,000 of my 15,000 gallons in order to get a fresh start and get rid of a very high cya.
I've been using pool math and feel I have a pretty good handle on the system and really appreciate this site and the great help.
Here are my latest numbers from yesterday afternoon.
PH 7.6 it has been rising each day on its own
my question is related to the cya relationship to the chlorine.
I've been using 4-6 for my FC min/target
it seems I've been losing 3-4 ppm each day which concerns me since the water is cold and nobody is swimming.
Pool math suggested about 96 oz of 8.25% bleach so I just put the whole 121oz jug in. I did an overnight test and saw no loss so I don't think I have anything using it up and the CC level of 0 would confirm that?
i bought the bleach at Target. Store brand. Maybe it's weak?
I think I need a little clarification about the cya relationship. I understand the higher my cya is the more bleach I need. But should the higher cya level help preserve the chlorine? In other words should the level hold better with higher cya? If I up the target FC to 10 should a loss of 3 ppm per day, does it make sense I would be at 3 in two days? That's just an example to try and understand what's going on.
thank you all very much!