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Hi, i tried the vitmin c test and it looks like its a metallic stain. can you please advise as to how get rid of it if its possible thanks

Topic split off by Moderator about 5 weeks ago i got what looked like staining under the liner of my pool. The liner is 11 years old and i have never had this problem before. Two things may have triggered it off !. 1. i bought a Floatron ioniser about 10 days before 2. i topped up the pool with...