Black algae or something else?

Stains on the pool surfaces, pool equipment
or on the swimmers, or off-color swimming pool
water. Discolored but clear pool water.
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My Pool: 20,000 gallon, plaster

Black algae or something else?

Postby Cronofl » Sat 14 Mar, 2020 23:22

I recently purchased a home that has a 15 year old plaster pool. After moving in, I noticed there is a black/dark brown stain spot about 2 inch in length in the deeper end of the pool. Initially, I tried to scrub it with a metal wire brush. A tiny bit of comes off like faint brown dust and fades away in the water. I went to the pool supply store and the guy said it may be black algae and had recommended me with scrubbing the chlorine tablet on it. The chlorine tablet scrubbing didn't do anything to the spot. I felt my finger over the spot it and felt rough just like the surrounding plaster and not smooth or slippery. I wonder if it is some kind of rust or other organic stain.


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My Pool: 28' x 10' indoor, liner, oil heater, sand filter.
Location: South Wales UK

Re: Black algae or something else?

Postby Phil.c » Sun 15 Mar, 2020 04:07

Sounds like metal staining to me especially if the chlorine tablet did nothing but just to confirm, put a vitamin C tablet an it to see if that removes it.

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