Yellowish Brown stains

Jasderz · May 26, 2015

Hi, this was the first year I opened my pool. I hired a company to come out and get it started for me, but I took over getting the pool chemicals balanced. The pool was green and filled with algae. It's been a few weeks since it has been open. The water looks great, except for these stains around the bottom edges of the pool. I've scrubbed them, but haven't been able to get any off. I also tried holding a chlorine puck against it, but that didn't do much either. I have my pool at shock level now, but nothing seems to be getting rid of these stains. Does anyone have any recommendations? Do you think it's mustard algae. It definitely looks organic to me. Here are my most recent test results.

FC- 12
CC- .5
Cal- 250
TA- 90
PH- 7.4
CYA- 30- it was at 0, but I brought it up to 30 recently.

FYI- The pool is plaster.

Thanks!

Azgirl71 · May 26, 2015

Could be iron staining. Try vitamin C tablets on the spot.

JasonLion · May 26, 2015

It certainly isn't mustard algae, that would brush off fairly easily.

armsdealer · May 26, 2015

I embraced my stains and called them art. Now I have priceless art at the bottom of my pool and not stains.

duraleigh · May 27, 2015

Identifying the stain dictates the treatment. The tri-chlor tab indicates it is not organic. Take cheap vitamin c tablets, crushed up in a sock, and hold them against the stain for about five minutes. The stain will hopefully disappear or greatly fade....now you know the stain is inorganic.

Jasderz · May 27, 2015

Thanks! I'll try Vitamin C. Here are a couple pics. I meant to post them before.

Jasderz · May 28, 2015

Also, I should clarify that my FC was at 12 because I just brought it up to shock level. It was at 1 before I did that. So I feel like it could be organic.