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    Is this Mustard Algae?

    The picture is really hard to see. It is on the walls in the shade and sun side (it does not get much shade), it brushes off without much effort, the chemical levels have been at normal range all year and water is crystal clear. I will brush it off and it will reappear in a day or two.
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    New Build FC=0

    I am on day 10 after start up of a new build. Water looks clear, no CC smell, problem is... i can't get the chlorine to read above .5 . I am using trichlor to start with, so CYA is getting added slowly. I doubled the recommended flow through the chlorinator but still no budge... does the sun...
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    Polymeric sand instead of caulk

    My friend mentioned using Polymeric sand instead of caulk at the expansion joint… has anyone tried this? I hate dealing with the caulk mess and don’t want to spend $1k on a contractor.
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    Southeast PA build

    After spending years getting out of debt, we decided to get back into it... never been happier to be broke. :-D The build started today. I will post pics as we go.[attachment=1:16uu90re]before.jpg[/attachment:16uu90re]