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    Unusual white stain? But isn't calcium..

    Hi @Rancho Cost-a-Lotta was your waterline ever up to those tiles? Thanks.
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    Unusual white stain? But isn't calcium..

    Thanks for the comments guys & girls! What's weird and I should've mentioned it before is its around the whole pool! I'll try a little acid on there and see if it fizzes.
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    Unusual white stain? But isn't calcium..

    Hi all, I've just bashed washed my in-ground pool in preparation for my holiday's and noticed the following. If I brush/slash with water the marking disappears for a minute before returning. Anyone know what it is? I've never seen this before. Thanks! PH: 7.7 TA: 100 FC: 7 CH: 375 CYA: 70...