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Thread: Metal Magic with pool heater

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    Metal Magic with pool heater

    My sister opened her pool this year and found a huge stain covering the deep end. They didn't check their pH at all last summer, the water was so acidic it ate the copper in the heat exchange, which settled over the winter.

    They had a new heater installed - Sta-Rite SR333NA - and the pool store guy recommended Metal Magic to remove the stain.

    I'm guessing we don't want Metal Magic going through the heat exchange. My heater has a manual bypass, the SR333NA does not. There's a brief mention in the Sta Rite manual of a bypass switch. So my question is, does water flow through the heat exchange when the heater is off? Or do I need to manually bypass the heater while we're using Metal Magic?

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    Mod Squad pooldv's Avatar
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    Re: Metal Magic with pool heater

    Metal magic won't hurt the heater. It may not lift the stain either. It is a sequestrant and binds to metal in the water. If it doesn't lift the stain then ascorbic acid is usually the best way to lift the stain. Ascorbic Treatment to rid Pool of metal stains
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    Re: Metal Magic with pool heater

    Thanks pooldv- if I use ascorbic acid, or Jack's, do I need to be concerned about the heat exchanger?

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    Mod Squad pooldv's Avatar
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    Re: Metal Magic with pool heater

    No, not as long as you keep PH 7.0 or higher. Preferably 7.2, but a dip to 7.0 for a bit is OK. Jacks won't hurt it at all. In fact the only thing that could hurt the heater is low PH.
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    Re: Metal Magic with pool heater

    Quote Originally Posted by mpr5231 View Post
    My sister opened her pool this year and found a huge stain covering the deep end. They didn't check their pH at all last summer, the water was so acidic it ate the copper in the heat exchange, which settled over the winter.

    They had a new heater installed - Sta-Rite SR333NA - and the pool store guy recommended Metal Magic to remove the stain.

    I'm guessing we don't want Metal Magic going through the heat exchange. My heater has a manual bypass, the SR333NA does not. There's a brief mention in the Sta Rite manual of a bypass switch. So my question is, does water flow through the heat exchange when the heater is off? Or do I need to manually bypass the heater while we're using Metal Magic?
    An internal bypass which all units have is not like an external bypass of which you can add to your plumbing. The internal bypass just allows for excess water to flow back to the pool but it does not prevent water from going thru the heater like you can do with an externally built one. An externally built one allows you to isolate the heater so no water flows thru it at all. That's the best thing ti have if you need to perform aggressive stain treatment of resurfacing that might require and acid wash.
    Paul
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