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Thread: Liner feels like sandpaper

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    Liner feels like sandpaper

    I opened my pool the middle of May and haven't gotten the liner clean yet. I thought maybe it was scaling because we have a private well and the water is very hard, but there are also black or very dark green spots, which I assumed was algae. The whole liner appears to have a white-ish coating on it and is rough. I read something about sand algae and thought maybe that was my problem, but I can't seem to find that post again. I have been told that I might can get it off if I keep my alkalinity low, but that could also cause damage to my heater, which I don't think I can bypass. I have been trying to keep the alkalinity in the 80-90 range and my chlorine as high as possible and have been brushing almost daily. At first I thought that was working because it seems like every time I brush I get a little more off, but here we are at the end of July and it is still there.

    Also, we had pulled the ladder out of the pool and when it dried in the sun, I was very easily able to just brush it off. It did almost look like sand if you rubbed it off. I was able to pull away a couple of flakes with out them falling apart. I had read that if you put it in vinegar and it bubbled, that it was calcium. It did not bubble and it did not dissolve when left in a bowl of straight vinegar overnight. I don't know if that helps anyone figure out what it may be or not.

    Here is my latest reading:

    Cl - over 5.0 (it was darker than the yellow at 5.0)
    Ph - 7.2
    Alk - 80
    Hardness - 460
    CYA - 50

    To add insult to injury, I must have a leak somewhere, as I have to add water weekly. I lose a good 4 - 5" at least weekly and as I said, it is well water that I am adding. This also makes it very hard to maintain consistent balance. Any ideas???

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    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Liner feels like sandpaper

    It is probably calcium scale with algae imbedded in it. A picture would help.

    The VERY long term approach is to lower your pH CAREFULLY down to around 7.0 and then leave it there until the scale goes away. That approach can take a couple of swim seasons....really. Bypass your heater and you can probably get away with lowering to 6.8 but that starts to get a bit dicey unless you manage it well.

    The other approach is to partially drain the pool and brush it off and start over. Is it also on the pool bottom? Draining the pool has some consequences so don't do that until you have a good understanding of what's involved.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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