strange black stains
strange black stains
Guys, I have 3 black spots at the bottom of my 30 year old pool. There each about 6" in diameter. Ive had 2 pool guys look at it and no ones knows what it is. Ive tried putting muriatic acid directly on it, scrubbing it with a metal brush...Nothing. So this weekend I got a file and attached it to a long pole and filed/chipped some of it away. Now I can feel the groves are deep and its still black-im guessing its not just on the surface. Im thinking it might be a deep patch repair. But why would someone use a patch that would turn black over time? The other thing I noticed is that it develops a orange/rust colored surface corrosion after a few hours after I brush it with a metal brush..Im not got to file any more in case I do damage to the pool. I appreciate any help!
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- Pool Industry Leader
- Posts: 1337
- Joined: Tue 17 Oct, 2017 10:52
- My Pool: 12 x 24 (45m3) liner pool, Triton TR60 filter with AFM glass media (Activate) and variable speed pump running 0.08HP
- Location: UK
Re: strange black stains
Hmm, as you say, possible repair, the rust could be the rebar in the concrete as I have repaired this before for a customer.
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