Fresh plaster + dirty water = problem?


Active member
May 7, 2019
Daytona Beach, Florida
As far as I understand, there are plugs which get inserted into holes in the drain once they are ready to fill. This is to give the groundwater a place to go (into your pool) instead of popping your pool out of the ground. I was more concerned of water, especially dirty water, staining the plaster. But, I'd assume the acid wash would take care of any staining that may happen overnight.


Bronze Supporter
Jul 17, 2019
Prosper, TX (DFW)
Those plugs you refer to are/were in the gunite and are filled right before they do the plaster. Those holes you see are the actual drains that should be connected to your pool plumbing leading back to your pump filter, just like your skimmer. You should be worried about staining, leaking pipes, etc.

Did you not call your PB?


LifeTime Supporter
TFP Guide
Feb 6, 2015
Chandler AZ
The main drains probably also contain hydrostatic valve ports - these hydrostatic valves will be installed right before they install the main drain covers and start to fill the pool.

That being said, I'd call the PB and advise them that dirty water is entering the pool. Whatever action they take/don't take, be sure that area gets extra attention when they acid wash.


Well-known member
May 3, 2019
We did a re-plaster in July. Exact same thing - hydrostatic values and dirty ground water. I was so worried. However, after the acid wash no issues and you can not see anything to indicate staining. It was normal for us.