Can someone tell me what this is?

[TwoBananas]

Hello!

Due to his forum, my pool is clear for the first time. I can see the bottom. However, after turning the pump off for 24 hours (I set the timer wrong and it didn’t kick back on), I came out this morning to find this powder all around the edges. The pool was hazy before the filter was off for this long.

Is this white powder calcium build up? I did add a bunch of cal hypo about two weeks ago.

 

[YippeeSkippy]

Yes, it *looks* like calcium to me..... try to pick some up and put it in the grass. Drop a drop of muriatic acid on it and if it bubbles, its calcium!
Can you share you test results?
FC
CC
pH
TA
CH
CYA
Salt if applicable?

Maddie

 

[TwoBananas]

Yes, it *looks* like calcium to me..... try to pick some up and put it in the grass. Drop a drop of muriatic acid on it and if it bubbles, its calcium!
Can you share you test results?
FC
CC
pH
TA
CH
CYA
Salt if applicable?

Maddie

FC 7
CC 0.5
pH 7.7
TA 130
CH 250
CYA 40

Unfortunately, I did not get to scoop any out as I didn’t see this until after I turned the filter on and it all kicked back into the water.

Didn’t expect such a fast reply!

If it is Calcium, how the heck do I get it out without spreading it around the pool? My Dolphin just seems to stir things up.

 

[JJ_Tex]

Hmm... I would say dead algae, especially since you mentioned a cloudy pool and have CC of 0.5. Did you do a SLAM to get rid of your cloudiness?

You can do an OCLT to see if there is algae somewhere.

 

[TwoBananas]

My chlorine loss is zero. I’ve had this blue cloud that I was convinced was algae for over a month (hence the desperation use of cal hypo twice), but I’m not losing any chlorine. Like a point every few days. CYA and pH stable. Can’t tell what’s going on.

 

[YippeeSkippy]

Just turn the pump off overnight and let the stuff settle. Then vac it out to waste and see how things look. It might be better if you get it all out once and for all. THen we can see if its algae or not?