pH and SLAM - add acid now ?

Karl103

Bronze Supporter
Aug 18, 2018
53
Rolesville, NC
Pool Size
13000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Hayward Aqua Rite (T-9)
Hi everyone,

Doing my first SLAM - everything looks good - pool already blue after initial shock level. Water mildly cloudy but clearing. Thinking probably have a few hours more to go and still need to do the OCLT tonight.

Problem - I forgot (and did not realize) to lower the Ph before starting the SLAM. And now of course, it is too late to check the pH reliably.

Here are my readings pre-SLAM (21 hours ago):

FC 7.8
pH 7.6
TA 70
CYA 60
CH 270

Have added a lot of bleach obviously during the SLAM process which I know raises the pH even more. FC now 20.

Should I add some muriatic acid using the pre-SLAM pH or just wait till I am finished (probably fininshed in next few hours) Kids are getting anxious to swim and will probably want to go in before FC is less than 10 so not sure I will get an accurate reading.

Any thoughts ?
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
41,573
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Have added a lot of bleach obviously during the SLAM process which I know raises the pH even more.
Liquid chlorine is pH neutral.

I would add enough acid to lower the pH from 7.8 to 7.4.
 
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