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Thread: Weird white powder in spa

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    Weird white powder in spa

    Hi all! Long time since I've posted, because I haven't really had any major issues.
    However, the last six months or so I've had this weird powder build up in my spa that spills over into my pool. It build up quickly - in a week I can get a pile 2-3 inches deep, by 12 by 12 inches - only in the spa. I scoope it out and it looks like, well, potato flake that haven't dissolved in the water. Kinda feel mineral-like.

    I've also replaced my chlorine generator, and although I've cranked it up to 100%, I'm struggling to maintain my chlorine. I added some stabilizer since my CYA levels were low though, so perhaps that will help. Any thoughts on this powder? I can post other test results later in the week when home, but as I recall they were all normal.

    Photo of powder when scooped out and put on pool deck and let dry:

    Photo of pile of powder by drain:

    Thanks for any thoughts here!

    Phoenix, AZ (Goodyear actually)
    Pool finally complete!!! IG, 40,635 gallons w/2080 gallon spa with 16 jets. Pool is 40x21 ft with 10 ft deep end; two baja steps
    Pentair Cartridge filter - 520 SQ. PebbleSheen interior. 2 Pentair VS pumps. Pentair Intellichlor SWG
    4 deck jets, 2 bubblers, fake rock grotto/waterfall with wet steps. 3 surrounding half-pergola's with misters in future
    Sunken covered ramada with cabinets, fridge, and wood fireplace. (soon to have big screen TV)
    Basically, 14 years of planning on how to survive this blistering AZ summer!!! WAHOOOOO!!!!!!

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    JoyfulNoise's Avatar
    Join Date
    May 2015
    Tucson, AZ

    Re: Weird white powder in spa

    Drop some in diluted MA and see if it fizzles. If it does, it's calcium scale. Could be related to your 100% SWG settings. If your struggling to maintain FC, do an overnight chlorine loss test, you probably are fighting a nascent algae bloom. SWGs are easily overwhelmed with algae.
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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