Howdy!
Newbie to the site and to pool ownership here. I just want to understand the chemistry happening here. Back story: pool start-up yesterday at about 5p with MA, CA, and chlorine. Test results:
7/2 @ 2235:
FC 6.5, CC 0.5, pH <7.0, TA 90, CA 240, water temp 80
7/3 0800:
FC 6.0, CC <0.5, pH 7.0, TA 90, CA 240, CYA 62, water temp 78, SI -0.58
7/3 1545:
FC 4.5, CC (not checked), pH 7.2, CYA 66, water temp 82, SI -0.28
7/3 2020:
FC 4, CC <0.5, pH 7.4, TA 90, CA 240, CYA 68, water temp 82, SI -0.12
Now, I understand that the pH is going to increase particularly because it's a new pool, per Pool School's The ABC's of Pool Water Chemistry. What I'm trying to wrap my head around is the increasing CYA level. I'm not adding CYA. I didn't even think that the PB used chlorine w/ CYA yesterday but there it is! It came from somewhere. The pool has been used today for a couple of hours. I'm not understanding why my CYA levels are increasing without adding any. Can someone help guide me, please?
Newbie to the site and to pool ownership here. I just want to understand the chemistry happening here. Back story: pool start-up yesterday at about 5p with MA, CA, and chlorine. Test results:
7/2 @ 2235:
FC 6.5, CC 0.5, pH <7.0, TA 90, CA 240, water temp 80
7/3 0800:
FC 6.0, CC <0.5, pH 7.0, TA 90, CA 240, CYA 62, water temp 78, SI -0.58
7/3 1545:
FC 4.5, CC (not checked), pH 7.2, CYA 66, water temp 82, SI -0.28
7/3 2020:
FC 4, CC <0.5, pH 7.4, TA 90, CA 240, CYA 68, water temp 82, SI -0.12
Now, I understand that the pH is going to increase particularly because it's a new pool, per Pool School's The ABC's of Pool Water Chemistry. What I'm trying to wrap my head around is the increasing CYA level. I'm not adding CYA. I didn't even think that the PB used chlorine w/ CYA yesterday but there it is! It came from somewhere. The pool has been used today for a couple of hours. I'm not understanding why my CYA levels are increasing without adding any. Can someone help guide me, please?