Can’t keep my Chlorine levels.

mdmello

Member
May 4, 2021
15
Toronto
Pool Size
80000
Surface
Vinyl
Chlorine
Salt Water Generator
SWG Type
Zodiac LM3-24
I normally haven’t had an issue with my FC or CC but was getting rid of a stain and now my FC is 0. I’ve shocked it twice with a 1Kg each time and it goes up but then it’s gone by time sun comes.

I turned up my salt generator too 100% and used the super chlorinate process. I will add another round of shock. Does anyone know possible reason? I thought it was chlorine lock but both FC/TC 0.

All other levels are balanced and water is clear.
 

Kevinr14

Silver Supporter
Mar 8, 2021
296
Chandler, AZ
Pool Size
15000
Surface
Plaster
Chlorine
Liquid Chlorine
I normally haven’t had an issue with my FC or CC but was getting rid of a stain and now my FC is 0. I’ve shocked it twice with a 1Kg each time and it goes up but then it’s gone by time sun comes.

I turned up my salt generator too 100% and used the super chlorinate process. I will add another round of shock. Does anyone know possible reason? I thought it was chlorine lock but both FC/TC 0.

All other levels are balanced and water is clear.

Were you using absorbic acid for the stains?
 

Kevinr14

Silver Supporter
Mar 8, 2021
296
Chandler, AZ
Pool Size
15000
Surface
Plaster
Chlorine
Liquid Chlorine
No. Just a stain remover, I did have to add water to the pool as well after as water levels dropped. Then used stain and scale due to copper levels raising a little. Then after 24 hours i shocked it

What are the ingredients of the stain remover? Absorbic acid will reduce chlorine but I'm unsure whether or not there is a residual which stays in the pool for a while. Otherwise, it's probably the usual issue of an algae bloom in the works if you're losing chlorine overnight.
 
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