CSI in winter for fiberglass pool

Karl103

Bronze Supporter
Aug 18, 2018
53
Rolesville, NC
Pool Size
13000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Hayward Aqua Rite (T-9)
Hello there,

I keep my pool open in the winter and note again that my CSI is going very low. I have a fiberglass pool and not really sure if CSI really means much in the winter with fiberglass. I could certainly increase the Ph to 8 which others have suggested and increase the calcium but is this type of micromanagment in the winter non-swimming months really worth it?

Here's my latest numbers:

FC 3.6
pH 7.6
TA 60
CH 240
CYA 60
water temp 38 F
CSI = -0.91

I haven't done much with TA since I tend to keep this low in the summer with my SWG. Can certainly add some Baking soda but again - is it really worth the time and energy ?

Thanks,

Karl
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
36,407
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Low CSI in fiberglass is not meaningful. Unless you have a grouted waterline tile, which it does not appear you have.

No changes needed.
 
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