So we have a new pool, above ground, that has been filled for probably just about a month now. I've been following the TFP method, and we've had great results with water clarity. But we're starting to see a brownish greenish ring around the water line and just below the water line. I've scrubbed the Crud out of if with very little effect. The pool was filled with water from the house spigot/hose. I did look up the village's water report and found the report from 2020 saying they found 1.2 ppm of copper in the tests, which seems high. So I'm starting to think its copper staining. I know the TFP idea is not to add a ton of extra stuff to the pool beyond stabilizer and keeping the FC in range, are there "TFP Approved" sequestrants for the metals? I feel really bad for my mother in law who put in a nice new pool and its already looking dirty, especially since I volunteered to keep it clean!