Did the rain change my numbers?


LifeTime Supporter
May 9, 2015
Fullerton, CA
We have had a ton of rain in so ca over the past month. Decided to test everything today.
TA-60 (down from 80)
CH-200 (down from 275)
CYA- 40 (down from 60)
Salt -2000 (down from 2900)
CSI- -0.51

My salt cell has not been making chlorine for the past month or 2 error 144 low salt, I thought it was down to the cold water temp (50-60F). Water is now at 64.


Now I need to add 82 lbs of salt so my cell will start making chlorine again. Never thought rain would make such a change.


Mod Squad
LifeTime Supporter
Jul 10, 2012
Tallahassee, FL
I am in FL and can tell you for a fact I have to adjust for a BIG rain event. The drumming of the rain can push PH up. Adding water (rain) does "dilute" the pool water so there will be changes.

Make a note on your pool log about the rain. This will help you learn what needs to be done after such an event.



TFP Expert
Platinum Supporter
LifeTime Supporter
Moderator Emeritus
Aug 10, 2012
FL panhandle
Yes, definitely normal after a lot of rain. Rain has no TA, CH, CYA or salt so it will definitely dilute those.