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Thread: Where does scale go?

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    Join Date
    Jan 2010
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    Northern Virginia
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    Where does scale go?

    I have a gunite pool with a SWG and I'm using borates but I still have a slight scale problem. I'm constantly lowering the pH and brushing/scraping to remove the scale. Most of it is very small and turns into "dust" as I brush it, but some is larger and comes off in "chunks" (especially on the tile above the water line).

    Anyhow, I was wondering what happens to the scale that is removed? Does it stay in the water and reform as scale? Does it get trapped the filter (DE in my case) and get removed when backwashing? After I brush it off, does it remain to cause more damage?

    Thanks!
    Bart
    700 sq. ft./30,000 gal, gunite pool; 48 SF DE filter; 1.5 HP pump; Salt Water Generator; Solar Heat

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    duraleigh's Avatar
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    Apr 2007
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    Re: Where does scale go?

    Calcium scale will redissolve into solution and stay in your water until you let pH and TA slip back up out of range and then it will precipitate right back out into a solid.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Where does scale go?

    Thanks!
    700 sq. ft./30,000 gal, gunite pool; 48 SF DE filter; 1.5 HP pump; Salt Water Generator; Solar Heat

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    Richard320's Avatar
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    Re: Where does scale go?

    Ditto to what Duraleigh said. And I'll share my experience: patches of scale shrink as they dissolve into solution. For whatever reason, if pH drifts up (in my case, leaving town for a week) when it reforms, it tends to stick to the existing patches.

    I use pool water to water the lawn, then replace it with lower Calcium tap water to be rid of excess CH. It's a pain, but it's cheaper than a full drain and refill at once, and no water waste.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Where does scale go?

    Quote Originally Posted by Richard320
    Ditto to what Duraleigh said. And I'll share my experience: patches of scale shrink as they dissolve into solution. For whatever reason, if pH drifts up (in my case, leaving town for a week) when it reforms, it tends to stick to the existing patches.

    I use pool water to water the lawn, then replace it with lower Calcium tap water to be rid of excess CH. It's a pain, but it's cheaper than a full drain and refill at once, and no water waste.
    I love that you water your lawn with the drain. We just did that last night. Had to drain to lower CYA
    New pool owner 3/2013 14,000 gal pebble tec, 7 ft jacuzzi with spillover into pool.
    FNS +48 DE filter, raypak2100 heater, Pentair whisper flo 1.5, Hayward pool cleaner. TF 100 test kit.

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    chiefwej's Avatar
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    Re: Where does scale go?

    If you balance the water carefully you won't have scale. I had a lot of problems before I found the forum. Lowered my TA to help with pH rise. Now I use the Pool Calculator to keep a very close eye on my CSI.

    We have very hard water and extreme evaporation rates. The calcium level in my pool right now is well over 1,000, yet I have no scale at all. That is too high and I will be doing an RO treatment on the pool soon, but it shows with diligence you can manage very high CH levels with no scale.
    chiefwej
    Tucson, AZ
    16x36 rectangular (19k) Pebble Tec play pool/spa, Pentair Intelliflo VS 011018, Super II 2hp (spa), Aqua Rite T-15 SWG, Pro Grid 60 DE, Hayward H400 & Heliocol Solar heating, A&A infloor system, fill water w/high CH and TA, 50 ppm borates,TF-100 test kit

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