Supplementing an SWG pool with Liquid Chlorine?

Charlie227

Silver Supporter
May 8, 2019
73
Vero Beach, FL
I run my SWCG about 11-12 hours a day at 50-60% We switched to salt last fall so this is the first summer with the SWG We’ve had a pretty long stretch of extreme UV lately and no rain. Pool water is clear.

With the current weather, is it ok to supplement with liquid chlorine? If so, which chlorine product would you use? I prefer not to run the SWG at the highest % or run the pool pump more than 12 hours. I already replaced the first failed iChlor 30 under warranty.

My morning numbers (0730) today:

FC 3.5 Overnight FC loss less than 1ppm.
CC 0.0
pH 7.6
TA 80
CYA 75

So, would you supplement? The FC/CYA chart shows I should be at FC 6 and this system is struggling to get there and maintain.
 
Last edited:

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
20,589
Laughlin, NV
At 11 hours of pump time and 50% setting you are making 2.3 ppm FC per day for your pool. That is on the low side in your environment. You need to raise your % setting to 90 or run the pump longer to get to 4 ppm FC per day.
 
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AndyTN

Bronze Supporter
Mar 27, 2019
92
Memphis
I use liquid chlorine as my main source but I also have the trichlor pucks in the Rainbow feeder set to the lowest setting as supplemental. I am not able to check my pool chems ever single day so adding the liquid CH 2-3 times per week works for me while the trichlor pucks supplement in between. My wife certainly isn't going to be doing the tester bottles and pouring in bleach... I know the trichlor will raise my CYA slowly but water in Memphis is cheap so doing a water exchange is easy for me.
 
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Charlie227

Silver Supporter
May 8, 2019
73
Vero Beach, FL
At 11 hours of pump time and 50% setting you are making 2.3 ppm FC per day for your pool. That is on the low side in your environment. You need to raise your % setting to 90 or run the pump longer to get to 4 ppm FC per day.
Thanks Marty. I just set my SWCG to 90%. Will report back tonight with new numbers.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
20,589
Laughlin, NV
Raise your FC to target level with liquid chlorine. The SWCG is for maintenance, not increasing FC.
 

Charlie227

Silver Supporter
May 8, 2019
73
Vero Beach, FL
Liquid chlorine, bleach, chlorinating liquid, liquid pool shock, goes by lots of names. Walmart, Home Depot, Lowes, pool stores.
Thanks. I added a quart of chlorine (suggested by the Pool Math app) that I bought at Lowes today. FC is back up as of this evening 7.5. I will continue to run the SWG at 90% for another day to see if I need to reduce run time or lower % some. Thanks for the excellent advice.
 

Charlie227

Silver Supporter
May 8, 2019
73
Vero Beach, FL
Marty - if you can see my current pool math numbers, what do you think? The pool is very clear and the SWG is maintaining my FC at a run % of 90% for 10 hours. I added a quart of 10% chlorine to adjust the previous low FC.

Thanks.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
20,589
Laughlin, NV
The anyone with a unique link should be off. The Link from Troublefreepool.com user profile should be on.