Last summer we fought with what we were told was Mustard Algae We did everything we were instructed to do to fight this problem by the neighboring pool store but it never left no matter how often we treated, vacuumed, scrubbed etc. I noticed the same thing in the bottom of the pool this morning after just opening it up last weekend. Just all of a sudden it appeared.I really do not want to go through this again this year so I am in need of help...or else a buyer for a used pool.

Is there a picture somewhere of what mustard algae looks like so I can identify if that is what I have?

I also copied mwsmith2 reccomendations and am going to give that a try.

Thanks in advance.