Chlorine usage - is this reasonable?

Drew80

Well-known member
Feb 26, 2013
258
Austin, TX
I have a new-ish pool and I'm still figuring out the right balance for my SWG. I have a single speed pump that I'm currently running for 6 hours a day, which is plenty for water turnover, but I find that I have to run the SWG at 100% to keep up with FC. I'm burning through salt. I've tested the water multiple times in the past few weeks and the tests have shown no CC, so it doesn't seem like I need to shock. CYA is at 50.

Does this sound reasonable, or could there be contaminates that are somehow not showing up as CC? The water is clear, but we do have some water striders (insects) that tend to be attracted to algae. I'm confused.

Any help appreciated.
 

PoolGate

Gold Supporter
TFP Guide
Jun 7, 2017
5,092
Damascus, MD
Pool Size
29000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Jandy Aquapure 1400
Not sure what that model produces but a similar Jandy cell produces 1.25lbs or 20 oz per 24 hour period. For 6 hours that would be 5oz. 5 oz in your 10k gallon pool adds 3.6 FC. That sounds reasonable. What is your CYA level?
 

Msch99

Gold Supporter
Bronze Supporter
Jun 11, 2018
908
Verona, MO
Curious as to what you mean by “burning through salt”?
Salt level remains fairly constant unless exchanging water either by rain overflow, backwashing, or pumping to waste.
 

SouthVirginiaPool

Silver Supporter
Apr 26, 2020
104
Chesapeake, Virginia
I have the same T-15 cell, with a larger pool at 28,000 gallons. I found that running the SWG at 60% x 12 hours (low speed) keeps the chlorine level stable. I have dropped from 3100 to 2900 ppm for salt in 2 1/2 months so I'm almost ready to add salt but have not done so yet.
 

Drew80

Well-known member
Feb 26, 2013
258
Austin, TX
Curious as to what you mean by “burning through salt”?
Salt level remains fairly constant unless exchanging water either by rain overflow, backwashing, or pumping to waste.
I've had to add two bags of salt in the last month. We've gotten a lot of rain lately so that's definitely a factor, but it seems like it's dropping faster than it should.
 

PoolGate

Gold Supporter
TFP Guide
Jun 7, 2017
5,092
Damascus, MD
Pool Size
29000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Jandy Aquapure 1400
I've had to add two bags of salt in the last month. We've gotten a lot of rain lately so that's definitely a factor, but it seems like it's dropping faster than it should.
How are you measuring the salt level? The only test we recommend is the Taylor K-1766. Going by guess strips, the SWG readout screen or what a pool store tells you is not to be trusted.
 

Drew80

Well-known member
Feb 26, 2013
258
Austin, TX
I'm certainly no expert... and I don't have a SWG, but isn't the recommended CYA level 70 for SWG pools?
I'm certainly not either. I didn't expect the difference between 50 and 70 to be all that much, but maybe. I have a bag coming today - I'll see if that's the missing piece.