Chlorine and ph

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
33,340
Laughlin, NV
Do not test pH right after adding liquid chlorine. The whole process of chlorinating your pool water with liquid chlorine is pH neutral. It is slightly alkaline when just added.
 
  • Like
Reactions: UKjames

UKjames

Silver Supporter
May 1, 2020
92
United Kingdom
A good question to ask given my level of experience! But I have been testing 12to 24 hours later to see what next dose needs to be.
My TA is on the high side at 150 or so.
 

UKjames

Silver Supporter
May 1, 2020
92
United Kingdom
TA Is my problem I think then. There was a good bit of splashing in the pool today. I best either use the dry acid I have or bite the bullet and get some hydrochloric. How bad is dry acid?
 

UKjames

Silver Supporter
May 1, 2020
92
United Kingdom
The pool is inside a Perspex frame so no rain. Only dilution has been the recent large exchange I did to reduce cya from 300 to 60. I’ve Not added anything since then other than a handful Of cal Hypo mugs but now just liquid chlorine.

Otherwise draining Is just backwashing. Which having only just installed a working pressure guage I’m not sure how frequently I will do.
 

UKjames

Silver Supporter
May 1, 2020
92
United Kingdom
so after a day of no swimming my ph seems to have come back down to It’s usual level of around 7.6 from 7.9. Is that realistic or have I got some duff readings going on?