Liquid Chlorine / Bleach effects


Well-known member
Apr 2, 2007

I bought two jugs of liquid chlorine this weekend at Leslie's to shock my pool and the salesperson told me that using this much liquid chlorine would increase the pH. Therefore, I had to use muriatic acid to offset the pH increase. I have looked through various posts regarding BBB and there is no mention of this.

Can someone set the record straight for me? Thanks in advance.


Mod Squad
TFP Expert
Apr 4, 2007
SW Indiana
It may temporarily cause the pH to rise, but it won't have much effect that lasts. It may cause the pH reading to change if you add it all, but that is a result of high chlorine levels interfering with the pH test, not an actual pH change. Most likely he was trying to sell you acid.


Well-known member
Mar 27, 2007
Morris, IL
Well, I would not listen to a salesperson that is for sure. Now, having muriatic acid on hand is not a bad thing though. Do what you have to do to the chlorine, then test for the ph and see what happened. I doubt that there will be an effect though.


TFP Expert
Platinum Supporter
LifeTime Supporter
May 7, 2007
Silver Spring, MD
This is just one of the many myths about bleach that are popular with pool stores that don't sell bleach. The PH will go up a bit and then it will come down again, leaving it where it started.