Chlorine degradation


LifeTime Supporter
Sep 27, 2007
So here is a question for you chemistry folks.

It usually takes ~1.5 gallons of 6% chlorine/day to maintain my FC. If I added 4.5 gallons every 3 days would it be equally effective?


Well-known member
May 25, 2007
Based on the information presented my answer is no.

Adding potentially 3 days of chlorine leaves a large amount of the residual unprotected by CYA and will most likely be lost to the sun. When this happens the chances that the FC will drop to low during days 2 & 3 could allow organics to proliferate, leading to increased chlorine demand when you add again on day 4, leading to a cycle of less and less chlorine available and more and more problems.


TFP Expert
Platinum Supporter
LifeTime Supporter
May 7, 2007
Silver Spring, MD
No, won't work.

Sunlight destroys a percentage of your chlorine. So, the amount of chlorine lost per day is mostly a function of how much chlorine is in the water. If you raise the FC level extra by adding a triple dose of chlorine you will dramatically increase the amount of chlorine lost in a day.