Brown staining

ryang6

In The Industry
Mar 15, 2023
32
Florida
Recently started working on this pool which had been neglected in the past. The water wasn’t green but it’s clear the walls and floor hadn’t been brushed or vacuumed in quite some time. There was some evidence of green/yellow looking algae in the skimmer area. Overall the pool wasn’t horrible except for the stains.

I started slamming it at mustard algae strength, cleaning filter, brushing with 50/50 brush 3 days ago. Chlorine is still dropping slightly over night so I’m continuing but seems to be on very tail end. Here is what is remaining in the pictures. In person it’s brown. Copper test came back fine and vitamin c test negative. I plan to use stain test kit if chlorine doesn’t take care of it.

These are pictures after 3 days. It should be noted that the stains exist only where the sun does not shine on the pool this time of year (which makes me thing more algae stain than metal?). Pool is about 17 years old.

What are your thoughts?
 

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1st-
How are you testing? (List your kit in signature)
How frequently?
2nd-
There’s no need to go to Mustard Algae slam fc levels for staining only.
If mustard algae is suspected you follow the
SLAM Process at normal slam level fc
(31 ppm for you)
IMG_8403.jpeg
Until ALL 3 end of slam criteria are passed and only then do you raise fc to MA slam level for your cya (46ppm for you) for 24 hours only.
If someone else has been putting things in that you don’t know about you may have a tough time.
They should have documented what they used.
 
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