Algae again?

[aylad]

I'm guessing that you never killed it off completely the first time, although that's pretty much a WAG....but the fact that you had greenish water draining out of your filter tells me you still had living algae it there. This time keep your shock levels up for a couple of days or so after your water clears and it should get it all this time.

Janet

[dafletcha]

Not that I can help explain anything , but what was your pH? If it was on the high side, maybe FC of 7.5 isn't enough.

[matt4x4]

If it's mustard algae, it is entirely possible as i've learned first hand, 15 ppm only slows it down.
Check here for a visual comparison
http://www.poolforum.com/pf2/showthr...?t=5612&page=2