Liquid Chlorine- How Long Does It Keep It's Potency?

Joe Garcia

Member
Apr 9, 2020
23
Ft. Myers, FL
I'm buying 10.5% Hypo from Leslie's and I'm in the middle of my first SLAM. SLAM is working great, but how long can the 2.5 gallons last before losing it's potency? Second question, maybe not for this thread, but how do I know how much chlorine to add during the SLAM? If I need to get to 15 ppm and I'm at 12, how much to add to get to 15? Is there a formula or do I just add a couple of cups and re-test? I'm using a TF-100 test kit.
 

Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
but how do I know how much chlorine to add during the SLAM? If I need to get to 15 ppm and I'm at 12, how much to add to get to 15?
That's where the PoolMath APP (or PoolMath web page) are perfect. Those tools will tell you how much of anything to add to reach a goal.

Remember to always refer to the FC/CYA Chart so you know exactly what FC level too reach based on your current CYA>