I have already had to drain and acid wash my 6 mo old pool due to scaling so I'm paranoid about it now. I keep very close tabs on my pH and try to target 7.2 even though I rarely get to that (7.4 is a very good day!). My fill water has a CH of 300-----so how can my pool water test higher than that? Since my fill water is obviously on the high side to start with, is there anything else I can do to help prevent scaling? Sequesterant? I know at re-start (about 2 mo ago) they added 2 bottles of JM Purple Stuff. Will it help to add that at a maintenance dose level?
Here are my numbers:
pH: 7.8 (added acid tonight...it will go down to about 7.4 tomorrow and be right back up to 7.8 the next day....it's a vicious circle)
CH: 400 (usually tests at around 320-350----why would it jump to 400 now????)
CYA: not sure b/c I'm waiting on a refill for the test kit but has been right around 70