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  1. C

    What might this be?

    Wow. Just got back from another visit and the water chemistry is worse than I anticipated. Unless anyone disagrees, I think it best to work on balancing the chemicals before I address the stains (especially as getting a residual chlorine reading MAY take care of it). I'm coming here because with...
  2. C

    What might this be?

    Apparently 4th photo is over the limit but it was just a zoomed-in pic of that one by the steps. - - - Updated - - - @pooladdict: I will be checking chemicals as soon as I'm able. Do you have any suppositions in the meantime so that I could be researching?
  3. C

    What might this be?

    Hey all. Former professional now doing some independent maintenance for some family friends. However, my experience is mostly with gunite/hydrazzo/pebbletech/ANYTHING other than vinyl liners and fiberglass pools, for the most part. Anyway, these friends have a liner pool, and they have...