Yellow Staining

[Bnelson]

I have an above ground pool 17x29. Getting yellow staining on skimmer and ladder along with streaks on the floor and walls. Been using the pucks since weather is cold. Pool temp now is 80. Was 68 this past weekend and 72 last 2 weeks. MN weather.
Where do I purchase the absorbic acid?
And the sequestering agent? Local pool store?
Also have a mustard algae problem?

Drained pool the beginning of the year and refilled. Could that be the staining problem?

I use liquid chlorine 12% as shock. can I use that to bring chlorine up or reg bleach.

Kids want to have a pool party end of the week. Can they swim while it is being treated?

[CarlD]

What are your numbers:
FC--Free Chlorine
CC or TC Combined or Total Chlorine
pH
T/A Total Alkalinity
CH Calcium Hardness
CYA Cyunaric Acid--Stabilizer

You have been using pucks. It's likely your CYA is very high, making it likely your FC isn't high enough, and you may have mustard algae.

On the other hand, it could be something else--but I'm not sure what metal causes yellow staining--green is copper, red or pink is iron.

But the initial round of numbers is necessary first.

[Bnelson]

Im thinking since I drained pool and refilled, the new water had some metal in it.
Alot of the mustard algae is gone. Finally.

Temp was 80. back to 74 this morning.
readings from last night are from a pool store. Ran out of CYA agent.
CYA 27
TC 6.5
FC 6.1
PH 8
Adj Total Alk 148
Hardness 252

[CarlD]

Im thinking since I drained pool and refilled, the new water had some metal in it.
Alot of the mustard algae is gone. Finally.

Temp was 80. back to 74 this morning.
readings from last night are from a pool store. Ran out of CYA agent.
CYA 27
TC 6.5
FC 6.1
PH 8
Adj Total Alk 148
Hardness 252

IF these numbers are right (and let's assume they are ballpark) then you need to lower your pH to the 7.2-7.3 range and shock the heck out of it. At 8.0, your chlorine has lost most of it's effectiveness, and your TRUE T/A is lower.

Start there and see if that helps. Shock to 15ppm.

That's my best guess for where to begin.

[Bnelson]

OK, Brought chlorine to 0 and Got yellow stains out of pool with absorbic acid treatment. YEA! Clear pool!

Readings now are
Temp 75
CYA 0
TC .4
FC 0
ph 7.8
TA 131

Am going to add bleach to bring up chlorine level as well as add some stabilizer.
How does that sound?

[aylad]

Sounds good, just remember that the stabilizer take several days to dissolve, so in the meantime you're going to have to add chlorine daily to keep the algae gone.

Janet