Help Cleaning Calcium Off Fiberglass Pool

Joined
May 7, 2025
Messages
2,068
Location
Central Texas
Life got really crazy last fall and my fiberglass, in-ground, 14,000 gallon pool was totally neglected. The calcium has been building for a while. I'm going to drain the pool completely and start over (yes, it's gotten so bad a family of frogs have moved in) and would like to remove the calcium deposits before refilling the pool. It needs to be as simple as possible, if such a process exists, as the pool can't sit empty very long in case it rains. Don't want it popping out of the ground.

I have a 3600psi pressure washer and a power broom attachment for my string trimmer. I can't count on any of the kids coming to help, so it will be my wife and I doing the work. She's retired. but I'm not, so my available time to do this will mostly be over a weekend, and I don't have the stamina I did even a few years ago. I can tell you, the pressure washer alone with a 40 degree nozzle does nothing to the calcium except make it wet for a few minutes. Thanks.
 
You need to get some acid on it. Vinegar, citric acid, lime away, something like that. I'd even consider HcL, but that would be very dangerous to handle, and best left to a professional.
 
drain the pool and use a chemical specific to fiberglass pool.
I wouldnt power wash.. at least not to remove the deposits which you want dry before spraying the chemicals.
 
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