Wire Brush Okay for Gunite?

Mark Shvitz

Active member
Jun 20, 2018
Gainesville, FL
I've been using a wire brush on my gunite pool, and it seems like a lot of junk ended up in the filter. Is it better to use nylon? I'm afraid what's going into the filter is gunite.

Amazon lists a lot of nylon brushes, but the ads say they're for vinyl pools.


Mod Squad
TFP Expert
Platinum Supporter
LifeTime Supporter
Aug 10, 2012
FL panhandle
Using a metal brush on plaster over a long period of time can shorten the lifespan of the plaster under some conditions, low pH and low CH typically. I mean over many years, like 5-10 years. If the junk in the filter is organic material then there is nothing to worry about. If it looks more like plaster dust or white powder material then maybe.

What are your typical test results for pH, TA and CH?


Well-known member
Oct 15, 2018
Phoenix AZ
We have a regular brush, a wire brush and a combo brush that has both. The wire seemed to be pretty harsh and the combo brush seems to be gentle yet still brushes well....the nylon brush seems like I am wasting my time.
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