Slow Dissolving Cal Hypo Tablets


Well-known member
May 20, 2019
San Diego, CA
If I’m on vacation, it seems like a good idea for continued sanitization to have some of these 3” tablets (Poolife NPT) in the skimmer. Question is how many, say, over a 2 week period, in my 24K gallon pool, and how much will it raise the CH?
Controlling pH is the other issue. Maybe trichlor in a floater? But not sure that would raise CYA unacceptably.


Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
Laughlin, NV
What is your CYA? Use Effects of Adding Chemicals in Poolmath to see what each trichlor or cal hypo tab will add.

The issue with the compressed cal hypo is they dissolve pretty quickly. So after the first day or two they will gone. Test a couple of them.