Can the CYA stay lower in the winter?

[DMS2014]

the water is cold. Our FC has been 3.5-5. Last water reading was tonight and is:
FC 3.5
no CC
CALC 300
TA 60
CYA 40
pH 7.5,6-ish

Water is crystal clear. Just wondering if it's okay to leave the CYA where it is for now.

 

[chem geek]

Yes, that should be fine. The active chlorine level is lower at lower temperatures (for the same FC/CYA ratio) and there's less sunlight on the pool so a higher CYA isn't needed. You can raise it higher when you open in the spring.

 

[langerking]

Wait, 40 CYA is low? I thought that is about perfect. I always try to target 40.

Nevermind - just realized you are on a SWG system.

 

[woodyp]

40 is kinda low for HOUSTON in the summer for FC related burn off depending on amount of full sun.