Ascorbic acid surprise.

[aylad]

If you have clear green, that's probably the copper precipitating out. You can log out to read through the Metals forum until your registration is upgraded, but I'll ask Marie (the resident stain expert) or Ben (the other expert) to pop in and see if they can help.

Janet

[Watermom]

Curious --- why did you add the thiosulfate?

Welcome to the Pool Forum, by the way!

[Watermom]

Ben (the other expert) to pop in and see if they can help.

Ben who?

[sweep49]

Added sodium thiosulfate to burn out remaining 3 ppm chlorine. Thought that was part of the procedure else aa burns off the chlorine.

[mbar]

Ascorbic acid does not work the same on copper as it does on iron. It does seem like te ascorbic acid lifted the stain off the pool surface and is now in the water. You will have to get it to oxidize out to stain on your filter, but I am not familiar with cartridge filters, or copper stains. My advice would be to go on the Jacks Magic website. They have a lot of info about stains. They will probably tell you how to get rid of the green water using their products. Please keep us informed.