Runaway FC?

jlosurdo

Gold Supporter
Aug 15, 2022
12
Cedar Park, Texas
Pool Size
15000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Hayward Aqua Rite (T-15)
Just did my weekly testing:
FC: 19
CC:.5
TA: 60
pH: 7.94
CH: 275
Salt: 3200
CYA: 40

I’m thinking it might be time to turn down the SWCG from 70% 8 hours per day to 50% 8 hours per day. Thoughts?
 

Jimrahbe

Mod Squad
TFP Expert
LifeTime Supporter
Jul 7, 2014
28,090
Bedford, TX
j,

Your cell has no idea how much FC is in your pool. It just makes whatever amount of chlorine that you tell it to make. The cell has no brain.

You are the cell's brain, so you need to routinely test, and then adjust your cell's output so that your FC stays near your target level. See the saltwater section of this chart. FC/CYA Chart

Thanks,

Jim R.
 

Newdude

Mod Squad
Gold Supporter
TFP Guide
Jun 16, 2019
18,721
NY
I LOVE the back half of the season. Anytime you screw up and miss an adjustment, you overproduce and algae couldn't dare move in.

When you miss an adjustment time in the spring, it's the exact opposite and you'll be underproducing until you realize it. That could gift you a swamp.

Remember next year to be on the lookout for the cell not matching the daily loss until mid season when it starts to decrease again. (Think bell curve).
 

jlosurdo

Gold Supporter
Aug 15, 2022
12
Cedar Park, Texas
Pool Size
15000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Hayward Aqua Rite (T-15)
As usual, thanks for the quick responses. My pool is also heavily shaded, which I’d assume also leads to the FC creep.

I got in the pool after doing some house work, and while it was chilly (for a Texan), it was pleasant from a chemical perspective.
 
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