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Thread: Where's this thin layer of white scale coming from?

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    Where's this thin layer of white scale coming from?

    I have a very thin layer of some sort of deposit or scale that is coming through all the return lines in the pool & my spa. This has been going on for about a month now. My PB says "he's heard of that before, but does not know what it is." I haved cleaned my 4 cart filter, shocked, added salt, added acid...blah blah blah & no change! It's consistantly coming out, & not just a little bit. I can hardly keep up with the cleaning...

    I really looks just like cracked up egg shells. Ideas?
    ~UNDER CONSTRUCTION JUNE 08~
    SALT SYSTEM
    IG GUNITE FREEFORM WITH 12' RAISED SPA, 22K GALLON, 23' X 37', 3'6-6'6 FT, 105 PERI.
    FLAGSTONE COPING & STEPS, 2 LED LIGHTS, LIGHT GRAY PLASTER, SUNDEK
    PUMP= PENTAIR WHISPER FLOW 2.0 HP, PENTAIR CARTRIDGE 520 SF
    HEATER= PENTAIR 400K ELEC. IGN. LOW NOX
    CLEANER= POLARIS 280
    SPA BLOWER=1.0 HP

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    frustratedpoolmom's Avatar
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    Re: Where's this thin layer of white scale coming from?

    I don't know but I'll be paying attention....

    I cleaned my filter today and there will little bits of what I would describe as "cracked up eggshells". Not alot but a noticeable amount. I was definitely curious.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    duraleigh's Avatar
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    Re: Where's this thin layer of white scale coming from?

    Hey, welcome to the forum. Posting a full set of test results is almost always the first step in analyzing water issues. Do you have current test results for pH, FC, CC, TA, and CYA?
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    frustratedpoolmom's Avatar
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    Re: Where's this thin layer of white scale coming from?

    Quote Originally Posted by duraleigh
    Hey, welcome to the forum. Posting a full set of test results is almost always the first step in analyzing water issues. Do you have current test results for pH, FC, CC, TA, and CYA?
    Good point.

    CH too!
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Re: Where's this thin layer of white scale coming from?

    Welcome to TFP!!

    When I've seen similar, it's due to linear quat and higher salt levels - it should clear up within a week 8)
    Luv& Luk
    -Ted

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

    POOL SCHOOL, TF Testkits, Jason's Pool Calculator, CYA vs. cl chart, (Just a few DARNED handy links!)

  6. Back To Top    #6
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    Re: Where's this thin layer of white scale coming from?

    I have seen it also and sometimes it's calcium from improper water balance. What salt system do you have?
    You might find this useful
    water-balance-tips-for-a-swg-t3663.html

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    Re: Where's this thin layer of white scale coming from?

    Well since I added shock & acid my test results probably won't help? However, this has been going on for over a month now. I have not added any salt for at least 6 weeks. I have to confess...I tasted the stuff (didnt eat it) just to see if it was salty...NOPE!

    Taken from test strips:

    TC = 1
    FC = 3
    PH = +8.4
    TA = 180-240
    CYA = LESS THAN 30
    SALT = 4200-300 @ 40%

    I have a pic if I can figure out how to post it...hmm?
    Attached Images Attached Images
    ~UNDER CONSTRUCTION JUNE 08~
    SALT SYSTEM
    IG GUNITE FREEFORM WITH 12' RAISED SPA, 22K GALLON, 23' X 37', 3'6-6'6 FT, 105 PERI.
    FLAGSTONE COPING & STEPS, 2 LED LIGHTS, LIGHT GRAY PLASTER, SUNDEK
    PUMP= PENTAIR WHISPER FLOW 2.0 HP, PENTAIR CARTRIDGE 520 SF
    HEATER= PENTAIR 400K ELEC. IGN. LOW NOX
    CLEANER= POLARIS 280
    SPA BLOWER=1.0 HP

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    Re: Where's this thin layer of white scale coming from?

    And another pic & a close up of the flaky white stuff...
    Attached Images Attached Images
    ~UNDER CONSTRUCTION JUNE 08~
    SALT SYSTEM
    IG GUNITE FREEFORM WITH 12' RAISED SPA, 22K GALLON, 23' X 37', 3'6-6'6 FT, 105 PERI.
    FLAGSTONE COPING & STEPS, 2 LED LIGHTS, LIGHT GRAY PLASTER, SUNDEK
    PUMP= PENTAIR WHISPER FLOW 2.0 HP, PENTAIR CARTRIDGE 520 SF
    HEATER= PENTAIR 400K ELEC. IGN. LOW NOX
    CLEANER= POLARIS 280
    SPA BLOWER=1.0 HP

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    JasonLion's Avatar
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    Re: Where's this thin layer of white scale coming from?

    Your TA level is quite high, and your PH is way way too high. You didn't post a CH number, but unless your CH level is way way too low, you have a calcium scaling problem.

    You need to lower your PH right away. You should try to make sure PH never goes above 7.8. You should also start working on lowering your TA level. You also need to get a CH test result.

    The white flakes are most likely CH that is building up on the plates of the SWG and gets dislodged and gets out into the pool. If you have a lot of that coming out, you probably have more getting stuck inside the SWG and causing problems.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: Where's this thin layer of white scale coming from?

    Yes the TA is high I suppose because I shocked the pool tonight & added 2 gallons of acid (to reduce my PH).

    Don't have a CH test, but the TH = 500 range. To raise TA, I need to add some baking soda right? But first get the PH stabilized?

    Can I take the SWG apart & clean this stuff out?

    Thanks so much! After 1 month & no help from PB, this gives me some hope!

    Oh & Waterbear, thanks for the link, however that was WAY TMI for me, LOL! Made my head hurt...I'm a seamstress...not a Chemist
    ~UNDER CONSTRUCTION JUNE 08~
    SALT SYSTEM
    IG GUNITE FREEFORM WITH 12' RAISED SPA, 22K GALLON, 23' X 37', 3'6-6'6 FT, 105 PERI.
    FLAGSTONE COPING & STEPS, 2 LED LIGHTS, LIGHT GRAY PLASTER, SUNDEK
    PUMP= PENTAIR WHISPER FLOW 2.0 HP, PENTAIR CARTRIDGE 520 SF
    HEATER= PENTAIR 400K ELEC. IGN. LOW NOX
    CLEANER= POLARIS 280
    SPA BLOWER=1.0 HP

  11. Back To Top    #11
    JasonLion's Avatar
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    Re: Where's this thin layer of white scale coming from?

    The first priority is to get the PH down. I would aim for a PH of around 7.2. Since it is a very large PH change, don't do it all at once.

    You want to lower the TA, not raise it. To lower TA, see this article in Pool School.

    With TH around 500, you need to be sure you keep the PH at 7.8 or lower.

    The SWG cell should be checked, and if you see white scale, it should be cleaned. There should be instructions on how to do this in your SWG manual.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  12. Back To Top    #12

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    Re: Where's this thin layer of white scale coming from?

    I had this exact same thing for 3 years and my "pool guy" always said it was no big deal - I've taken back over my pool this month and discovered my chemistry was all out of wack and that my Ph and TA numbers looked like yours - as soon as I get my Ph under 7.8 I stop getting that discharge (which I'm now calling calcium dandruff) - if my Ph creeps up it appears again within hours. Should be an easy fix over a few days to get your Ph back in range and clear that up!
    11.5K gallon IG gunite - L shaped pool - Pebblesheen finish
    SWG, Intelliflo 4x160, cartridge filter
    Heliocol solar

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    Re: Where's this thin layer of white scale coming from?

    Quote Originally Posted by splishsplash
    Yes the TA is high I suppose because I shocked the pool tonight & added 2 gallons of acid (to reduce my PH).
    2 gallons of acid? That's a lot of acid, wow.
    15,000 gal Freeform Salt Water (SWG), Pebble Sheen with in floor cleaner. Hayward 1.5hp pump and 425sq ft Hayward Cartridge filter. 35sq ft Waterfall with separate 1.5hp Hayward Pump.

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