Canns

Hi im getting a black thin line in my hot tub my levels are good my water is clean I’m being told it’s a dirt line. Which I know it isn’t because as soon as I clean it away it comes back. But the line is darker on one side of the tub ?

Hi have got the same problem as you how did you sort the problem out ? Thanks

Hi I have the same problem as you how did you sort this in the end ?