[FONT="]I have a small (10,000ish) gallon concrete pool in Florida. A group of people came to my house right from the ocean and within a few weeks I started seeing black algae forming in the pool. Went to pinch a penny pools and they sold me a stainless steel brush, a qt. of Sun Coast Metal Control. They told me this would help loose up the outer shell/coating of the algae before scrubbing it. They also sold me quart of SUPER BLACK ALGAECIDE for killing the stuff. I did everything just like they told me. Most of it appeared to go away except for a few very small spots that I just couldn't remove. Within a week it started coming back right where it was before and just as bad. I did it all again with the same result. Needless to say, that gets expensive and frustrating. That all may be a little long winded considering my real question. Since my pool is so small, draining it is not an issue. I am wondering what would be my best approach, (other than replastering) to kill this stuff now I can get right to it. Chlorine wash? Acid wash? Something else?[/FONT]