I have a fiberglass pool and have been told that I should not use acid to lower the pH as it can degrade the fiberglass. What other options are out there to lower my pH and Total Alkalinity. I currently use a combination of liquid chlorine and cal-hypo for my sanitizers.
Lowering pH in fiberglass pool
- Thread starter Trippel
- Start date
Welcome to TFP!
Well, except for CO2 injection systems typically only found on large commercial setups, there's no way to lower pH other than acid. Such a setup also does not lower TA, so acid is always required in a pool.
Not sure who told you this, but there are hundreds on the forum who use acid in their fiberglass pool to no ill effect. The important thing is to make sure it is well circulated. Adding acid without the pump running can cause problems for any type of pool, but when added slowly in front of a return while the pump is running at a high speed will circulate it well enough to not affect the finish.
Well, except for CO2 injection systems typically only found on large commercial setups, there's no way to lower pH other than acid. Such a setup also does not lower TA, so acid is always required in a pool.
Not sure who told you this, but there are hundreds on the forum who use acid in their fiberglass pool to no ill effect. The important thing is to make sure it is well circulated. Adding acid without the pump running can cause problems for any type of pool, but when added slowly in front of a return while the pump is running at a high speed will circulate it well enough to not affect the finish.
When I add MA to my fiberglass pool I make sure its put in to a thin stream on to a running return, and I always brush around the wall and floor immediately after to be assured its mixed in.
Maddie
Maddie
I premix carefully in a 5 gal bucket with pool water and pour sloooooooly in front of a return with the pump on high.
- May 3, 2014
- 62,670
- Pool Size
- 6000
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40
That is unnecessary and dangerous. It is best to not handle muriatic acid twice like that. I just pour the acid in at the return. It will not harm the fiberglass. Mine is fine, 6 years of doing what I do. And I add acid twice a week.