This is a 33k in ground gunite SWG pool
CH – at what point ‘must’ the water be replaced to reduce CH? 750? 1000? Incoming water is 120ppm, it is no minor expense and hassle to drain the pool 2/3 and refill, dosing up salt, cya, borates, acid.
TA – 40 seems kinda low. pH is adjusted with liquid acid every 2-3 days. Pool started @ TA 150 a couple years ago and has been falling since. Is 40 OK?
CYA – low for my area, waiting to dose it up till I decide to replace the water now or later.
Overall – pool looks good, feels great, no CH build-up on tiles or SWG cell.