Party this Saturday and I have black algae or black stains

First I will be honest, I have no idea what I am doing when it comes to this pool; I have never owned a pool and the house we bought came with it. This growth started about a month ago and I have been battling it for 2 weeks now with no end in sight!

A local pool supply gave me copper sulphate and 6 bags of super shock to "treat" the pool and followup with a good scrubbing. I did the treatment and scrubbed many times and I can't get it out :( Our liner is vinyl with a sand bottom so there are divots in the bottom where the algae has settled and grown and I cannot successfully brush it out of the deep end to save my life. It is also growing up the sides in the deep end and I am scratching my head as to what else I can do.

suggestions anyone??

Suggestions?

1. Stay away from that local pool supply, that gave you copper sulfate.

2. Verify that you have black algae; I doubt that you do. Black algae forms lumps or layers, and can be scraped off with a fingernail. Swim down with a mask or goggles, scape a bit off, swim back up, and smear it on a white 3x5 card. If it's black algae, it will smear dark green. If it doesn't . . . or if you can't feel or scape it, it's black algae.

3. Consider your options: there are 3 types of black 'stains' commonly encountered in pools: black algae (only in concrete pools), copper oxide (in any pool which has been 'coppered' and then shocked!), and black fungus (only in liner pools).

NONE of these can be removed by this coming weekend! If it really is black algae, you *might* have been able to remove it IF you hadn't added copper. If it's copper oxide, removing it will be to be difficult. If it's black fungus, the only way to remove it, is to (a) drain the pool and remove the liner, (b) treat the under surface with antifungal chemicals, (c) then install a new liner.

4. Get an OTO / phenol red testkit . Your chlorine and pH levels are CRITICAL to both controlling algae AND avoiding further copper stains. Report test results here.

5. Run your filter 24/7.

By the way, fungal staining is most common when the ground under the liner is saturated. It's rare in vinyl pool on sloped ground, but not at all uncommon in pools that are on flat wet ground.

Good luck!