Pressure Washing Inground Plaster Pool Walls

munchiis

New member
Jul 25, 2019
4
Las Vegas, Nevada
I have to dump out my 20k gal pool and before refilling I plan on washing the walls is there a recommended PSI for plaster walls? I might repaint as well just wondering about which pressure washer I should rent.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
23,656
Laughlin, NV
Just a warning, draining a plaster pool at this time of year here in the desert is not good. The plaster can crack, fail, etc as it dries out and gets hot.

Why do you want to pressure wash the pool? I cannot think of any reason to do that. Let us know your issues.
 

munchiis

New member
Jul 25, 2019
4
Las Vegas, Nevada
Why do you want to pressure wash the pool? I cannot think of any reason to do that. Let us know your issues.
Yes I understand the many risks however the water is almost a dark green and the walls have a deep green I cannot get out by brushing. There are no visible deep cracks, however there are about 4 small spider web cracks but they are barely visible. I assumed my best course of action was to drain water and wash and refill.
 
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mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
23,656
Laughlin, NV
You have algae. It may or may not be a good idea to exchange the water based on water chemistry results. The algae can be eradicated by following the SLAM Process. But first you need your own proper test kit (see Test Kits Compared) to see what the parameters of the water chemistry are.

Pressure washing will not get rid of the algae. Algae is a chemistry problem, not a filtering or cleaning problem.