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Thread: Calcium buildup on walls and floor

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    Join Date
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    Calcium buildup on walls and floor

    Hi,
    I'm in Australia and have a quartzon pool. I have a lot of calcium stalamites coming from the walls and floor. The best way to get rid of them according to the manufacturers is to empty the pool and acid wash the whole area. The problem is that water in Brisbane is expensive and to refill would cost around $1500. Some one else told me to acidify the pool to below ph 6 and keep it that low for a week or more, scrubbing regularly.

    Does anyone think this would work successfully?. Also I am worried I may damage some of the fittings with a low ph. Would also probably be best to turn off the filter while i do it.

    Any feedback would be greatly appreciated
    Brad
    19,000 gallons
    Zodiac Tri Series SWG
    Hayward S310T Sand Filter
    Poolrite SQI 600 pump.
    IG Concrete, quartzon surface
    Built 1997

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    Re: Calcium buildup on walls and floor

    Welcome!

    Calcium deposits are usually a sure sign of a high langelier index, many users have adjusted their water balance to around the -0.5 range until the calcium has dissipated, or adjusted their balance and ran with a pH around 7.2 to still allow swimming. One of our resident experts from memory stated that merely correcting the balance to what it should be will gradully correct calcium deposits.

    Can you provide us with the following:
    a full balanced water test result including pH, TA, CH, Temp, (FC, CC, CYA, TDS) figures in brackets are not as important.
    Your primary source of disinfection, and source of shock disinfection

    Draining and acid washing your pool is generally not necessary, as is dropping pH to 6.0, I would never recommend these practices and I doubt anyone else would on this forum.

    Can you also edit your signature As detailed here: pool-school/read_before_you_post

    Regards
    Stuart
    Stuart Murray
    Scotland UK
    UK NPPOC

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    Re: Calcium buildup on walls and floor

    Thanks Stuart,

    The water will not be reading well atm . I have turned off the salt chlorinator for 4 weeks now .

    PH 6.8
    TA 40
    Total Chlorine 3
    Total Hardness 500
    Free Chlorine 3
    Total Bromine 5
    Cyan acid 0 or less
    Temp is 14 c or 57 F

    Thanks
    Brad
    19,000 gallons
    Zodiac Tri Series SWG
    Hayward S310T Sand Filter
    Poolrite SQI 600 pump.
    IG Concrete, quartzon surface
    Built 1997

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    Re: Calcium buildup on walls and floor

    CH is rather high, but given your other parameters I am surprised you have calcium deposits.

    Q do you know what your fill water levels are? Do you use Calcium Hypochlorite as your Chlorine Donor? Have you already adjusted pH etc to try and devour the deposits?

    Stuart
    Stuart Murray
    Scotland UK
    UK NPPOC

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    UnderWaterVanya's Avatar
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    Re: Calcium buildup on walls and floor

    Quote Originally Posted by Blue114
    The water will not be reading well atm . I have turned off the salt chlorinator for 4 weeks now .
    Where is the chlorine in the pool coming from while the SWG is off?

    Quote Originally Posted by Blue114
    PH 6.8
    TA 40
    Total Chlorine 3
    Total Hardness 500
    Free Chlorine 3.
    Total Bromine 5 Do you have bromine or chlorine? I assume chlorine. The bromine scale on the test only applies with Bromine
    Cyan acid 0 or less too low. Your FC should be rapidly consumed by sunlight!
    Temp is 14 c or 57 F chilly
    The CYA is too low unless this is an indoor pool. pH is very low which as I recall was the direction you were thinking about to dissolve the deposits. However since most pH tests "bottom out" @ 6.8 - it could be lower. Do you have any readings for what your values were when this started? How are you testing?

    At your current numbers you have a CSI of just under -1 which can cause problems.
    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
    13500 gal, Vinyl Liner, Fiberglass Slide, TF-100 Test Kit, Hayward 210T
    sand filter, A.O. Smith 1.5HP main pump motor (C48L2N134C1),
    Hayward SuperPump (model ?), Polaris 380 & PB4 Booster Pump

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    Re: Calcium buildup on walls and floor

    Hi

    Thanks for the replies. I'm not sure of my readings before I stopped the chlorinator as I always get my pool tested at the pool shop and they tell me what to put in. I am not putting any chlorine in the pool and the high reading is still residual chlorine from 4 weeks ago. (must have been too high then ) . The pool shop person wants me to lose all the chlorine so the acid works more efficiently when I bomb it. It's winter here and we are not using the pool ATM.
    Probably best to run my results after I lower the Ph then try to bring it back to normal
    Thanks. Brad
    19,000 gallons
    Zodiac Tri Series SWG
    Hayward S310T Sand Filter
    Poolrite SQI 600 pump.
    IG Concrete, quartzon surface
    Built 1997

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    Mod Squad Bama Rambler's Avatar
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    Re: Calcium buildup on walls and floor

    Is this an indoor pool?

    4 weeks is an unbelievably long time to have chlorine if you haven't been adding any. Even an indoor pool would be zero in that length of time. Especially with zero CYA.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    UnderWaterVanya's Avatar
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    Re: Calcium buildup on walls and floor

    Just turning "Off" the chlorinator is not enough - did you remove the pucks inside it? How high was the reading 4 weeks ago?
    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
    13500 gal, Vinyl Liner, Fiberglass Slide, TF-100 Test Kit, Hayward 210T
    sand filter, A.O. Smith 1.5HP main pump motor (C48L2N134C1),
    Hayward SuperPump (model ?), Polaris 380 & PB4 Booster Pump

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    Re: Calcium buildup on walls and floor

    Thanks for your replies.

    It's an outdoor pool but we are in winter here and haven't used the pool for 4 months.

    I actually had the rep from the pool surface manufacturers come and have a look at the calcium on the walls and she gave me a guidelines brochure on how to acid bath the pool.

    Believe it or not I have added 80 litres (21 gallons ) of muriatic acid to the pool and a lot of the scale has disappeared already after 16 hours. I check it at 24 hrs. and if it seems cleaned , I then vacuum the pool on waste removing all the sediment to the drain .If not yet cleaned I leave it again for another 24 hrs. and do the same . I am also brushing every couple of hours to help remove the scale. The less time I leave the pool acidic the better as it eats into the surface.

    Once I've vacuumed , I then drop the water level 1 foot and refill and start to balance the water again.

    That's the story so far. thanks .. Brad
    19,000 gallons
    Zodiac Tri Series SWG
    Hayward S310T Sand Filter
    Poolrite SQI 600 pump.
    IG Concrete, quartzon surface
    Built 1997

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    Re: Calcium buildup on walls and floor

    Hi,
    I have cleaned the walls and floor and they look good. I emptied 70% or the pool and refilled. Vacuumed on waste to remove most of the sediment in the bottom and on the walls and have added my chemicals . Had the filter going now for nearly 3 days.

    CH 230
    TC 2
    FC 2
    PH 7.4
    TA 100
    CA 30

    My only concern is that the pool still looks dull and cloudy. Does this seem a normal time frame to get the water back to looking good. Also, I was wondering if I should replace the sand in the filter as we have been here for 4 years and it may not have been done by the previous owners. It seemed to be working OK before i emptied the pool.

    Cheers
    Brad
    19,000 gallons
    Zodiac Tri Series SWG
    Hayward S310T Sand Filter
    Poolrite SQI 600 pump.
    IG Concrete, quartzon surface
    Built 1997

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    Re: Calcium buildup on walls and floor

    Minimum FC level for 40 CYA is 3ppm, so you need to raise that. Given your pools cloudiness I would be shocking the pool, which would be 16ppm for your CYA level At the mo, and running an overnight chlorine loss test. Unless there are any specific instructions from your pool rep on the matter.
    You should read the following Chlorine/CYA Relationship advice: pool-school/chlorine_cya_chart_shock

    All your other numbers are looking healthy, although Pool School does recommend a TA level of 60-80 for SWG pools.

    As for the sand filter, it may be worthwhile doing the hose overflow clean as described in "Pool Filter Comparisons" in Pool School, sand can usually go a long long time (sorry I can't remember how long it's recommended over here) before requiring replacement. pool-school/pool_filter_comparison.

    Glad to hear you got your problem sorted out!

    Regards
    Stuart
    Stuart Murray
    Scotland UK
    UK NPPOC

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    UnderWaterVanya's Avatar
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    Re: Calcium buildup on walls and floor

    Sand lasts "forever" but checking for clumping and washing it out as described and verifying the correct amount is there is a good idea.
    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
    13500 gal, Vinyl Liner, Fiberglass Slide, TF-100 Test Kit, Hayward 210T
    sand filter, A.O. Smith 1.5HP main pump motor (C48L2N134C1),
    Hayward SuperPump (model ?), Polaris 380 & PB4 Booster Pump

  13. Back To Top    #13

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    Re: Calcium buildup on walls and floor

    I have taken the valve off the filter and flushed the sand. How do you know how much is left withouttaking it out and measuring it?

    Brad
    19,000 gallons
    Zodiac Tri Series SWG
    Hayward S310T Sand Filter
    Poolrite SQI 600 pump.
    IG Concrete, quartzon surface
    Built 1997

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    Re: Calcium buildup on walls and floor

    Go to the hayward website and look to see if they have a diagram to demonstrate the sand level. 2/3 to 3/4 full is usually normal.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Calcium buildup on walls and floor

    Thanks
    19,000 gallons
    Zodiac Tri Series SWG
    Hayward S310T Sand Filter
    Poolrite SQI 600 pump.
    IG Concrete, quartzon surface
    Built 1997

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