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  1. I

    Black specs?

    These black specs show up a few hours after the initial shock (MPS). Algae? Oxidized iron/metal? Please help!
  2. I

    Iron filled filter?

    Hello, my fill water is high in iron. Had it tested, was told to add Metal Gon, it will suspend the metals and allow the filter to capture it. Now that my filter is full of iron, is it ok to rinse and put it back in? Like, spray my garden hose at it? I fear that will force some of the metals...
  3. I

    What are these black spots?

    These showed up the morning after adding my non-chlorinated shock (MPS). I think our fill water is iron heavy, related? Or is this algae? Doesn't wipe off with bleach, but does with muriatic acid. Again, these showed up after adding shock, so I'm thinking a metal got oxidized? Had plenty of a...
  4. I

    Black spots in tub?

    Hello, bought a used 2 person 130gallon hottub. Ran spa cleaner line flush for 3 cycles, emptying the tub each cycle. Wiped the shell down with bleach. Filled it for my final fill, balanced the alkalinity, pH, hardness, then added my bromine granules and tabs. Levels were good, bromine bank...
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