> Hi, I am in desperate need of help. I don't know how to use this site so that I can start a thread. I drained my 10k gallon in ground plaster pool 15 years old, to a pool light. I have been fighting black algae for 3 years in summer. So while pool was drained. I used a large sponge and washed the walls and floor of pool with 8.5% straight b;each. After a couple mins., I got black stains all over the plaster. I also washed out the wet niche with bleach as well. I started seeing the staining b4 I got the whole pool washed down, so I hosed down walls but no luck. Can you help me to post this so possibly someone can tell me what might have happened and what to do about correcting this staining? It is dark now otherwise I would take some pictures.
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> Thank you, very depserate,
> Bob
>
> Thank you, very depserate,
> Bob