Last year we he mustard algae or something that resembled it but it was never yellow or brown. More clear in color or white. I treated it and all was good last year.
It happens when we get horse hair worms.
this year we had horse hair worms and then the alge is back. The alge is not yellow but did look like sand and it was spreading. Now it is clear and blue in color. I have added yellow out - twice, algecide 60, terminator 2 algaecide, algaeKill granular with hydro-floc. I have added this stuff twice and I vacuum to waste the entire pool. It keeps coming back. I have had 2 pool companies out and they have given up. I've spent over $1000 to get rid of this stuff.
What at do I need to do?
here is what it looks like.