Rain and calcium


Apr 12, 2020
Southern Louisiana
Please talk to me about calcium. I live in southern Louisiana. We get INCHES of rain at a time. I think I will spend 200 more dollars on top of the 200 I have already spent before the summer is over. I should mention I have a speed stir to check calcium. I lost 50 with the last rain.

I think you can see my logs and all information in signature.
Last edited:


Mod Squad
TFP Expert
LifeTime Supporter
Jul 10, 2009
Houston, Texas
What would you like to know about calcium? Looking at your Poolmath records a loss of 50 ppm leaves you at 250ppm for calcium. You have room to use cal-hypo as a chlorine source if you wish. It will boost the CH after heavy rains. Just don't go past 400ppm.


Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
Laughlin, NV
Range is 250-650. Do not get hung up on the mid point that is shown in Poolmath. Adjust that number or just ignore it if you are in range.

The ranges were developed so that most pool owners can ignore the Calcium Saturation Index. If you are unable to stay in the range (like my pool), we manage CSI.
  • Like
Reactions: MikeTX