I don't understand ...

[mwsmith2]

Well, it's not mustard algae, because that stuff looks like....um..mustardish! It's definitely a yellow-green. Maybe it's white water mold? That generally doesn't happen in Cl pools though.

[GolfTop]

I shocked the pool yesterday, scrubbed with brush, and it's back again this morning. Looks just like yesterday, particularly in one spot along crease where pool begins to deepen.

Was at a dreaded pool store yesterday and described problem to an employee there, who said it sounds like white water mold.

Gosh dog. Anybody know how to treat that stuff?

[mwsmith2]

Luckily, pools are like horses, when they get sick you shoot them! Wait! No! I mean, when pools get sick, there's one treatment: Lotsa Chlorine. However, let's start first with posting a full workup of your pool water. Then we can go from there.

Michael

[GolfTop]

Ph 7.6
Cl 10
TA 120
CYA 50

[mbar]

I had water mold the first year I had my pool - when I was using baquacil. Does it smell like fish?? I kept smelling fish - my husband thought I was crazy! The water was beautiful. Then I started to see those clumps - looked like a wet tissue. It was water mold. It is very hard to clear up with baquacil, but lots of chorine will do the trick! Keep your pool at shock levels for about a week, which with a cya of 50 is at least a chlorine reading of 15. Don't let the chlorine drop below that. When the chlorine starts to hold, keep it for a couple of days more to be sure it is all gone - water mold is tough. Keep your filter running, and backwash.

[mwsmith2]

Ya left out Ca, which can also cause white stuff in the pool. Need to do that test too.

Michael

[GolfTop]

I chlorinate with bleach and have vinyl liner pool, so I never check for calcium. Will do so when I get home.

[GolfTop]

Hardness level 550. And check that guestimate on CYA. It's actually zero.