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Thread: Adding calcium

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    kkendall's Avatar
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    Adding calcium

    What are the acceptable methods of adding calcium to a pool? I'v read where some just spread it around the surface of the pool.

    Was wondering if it's a bad idea to open the skimmer valve to 100%, turning the pump on high, and adding it to the skimmer return a couple cups at a time over several hours.
    * 18.5 K Gallon, 8ft deep, IG, Pebble Radiance * Pentair VS 3050 Pump w/420 Cartridge Filter
    * Blue Square Q-360 In-floor Cleaning System * UltraPure UPP25 Ozone Generator
    * Pool startup: 09-04-2012 * TF-100 Test Kit

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    UN1017's Avatar
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    Re: Adding calcium

    It is best to predisolve in a bucket of water then distrubute around the pool. Also, since you are only about 12 days into your pool, woud give it a few more weeks before tinkering with TA or CH.
    15'x30' IG - Roman-style - 14K - Pebble Fina Classico
    Filter: Jandy CL460 Pump: Jandy Stealth SHPF1.5 SWG: Jandy AquaPure 1400 Cleaner: Jandy RayVac Test Kit: TF-100 w/SpeedStir

    Chlorine/CYA Chart----Extended Test Kit Directions----SLAM

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    Re: Adding calcium

    People with more experience than me can probably give you better advice about adding calcium, but I will relate that I too added calcium in the first few weeks after we opened our pool. I now realize I probably didn't need to since our tap water has a fair amount of calcium - now I battle with too much calcium. In retrospect I could have waited and the water would have been at goal levels within a few months without adding additional calcium.
    10K IG, Gunite with Wet Edge "Midnight Ocean" pebble surface, with spa, tanning shelf, and fountain. Pentair Intellibrite LED pool and spa lights. Rola-Chem chlorine pump (and tank), Pentair DE "Quad 80" cartridge filter, 400K BTU gas heater, VF Whisperflo, and Legend Pressure Side Cleaner with Pentair booster pump. Using TFTestKit.

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    Butterfly's Avatar
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    Re: Adding calcium

    Make sure to follow instructions from the builder so nothing is done to void the warranty.

    Have you tested your fill water for CH?

    More info:
    See Pool School: pool-school/pool_plaster_start-up

    Here's a link to National Plasterers' Org. Start-up Card: http://www.npconline.org/start-up-card
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    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

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    kkendall's Avatar
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    Re: Adding calcium

    Per the startup card:

    4th THROUGH THE 28th DAY
    After the 4th Day - calcium levels should be adjusted slowly over the 28 day period not to exceed 200 ppm

    My CH Tests
    4-Sep Pump Startup
    7-Sep 120
    11-Sep 130
    16-Sep 150 (was 150 a couple days ago as well)

    Mixing about a pound of Hardness Plus (Leslie's) in a bucket of pool water - then pouring back in around the pool - then runing the pump for about an hour.

    Will test and then repeat every few days if needed.
    * 18.5 K Gallon, 8ft deep, IG, Pebble Radiance * Pentair VS 3050 Pump w/420 Cartridge Filter
    * Blue Square Q-360 In-floor Cleaning System * UltraPure UPP25 Ozone Generator
    * Pool startup: 09-04-2012 * TF-100 Test Kit

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    Re: Adding calcium

    Have you tested your fill water for CH?
    +1...Have you?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    kkendall's Avatar
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    Re: Adding calcium

    No, I haven't. (yet)
    I'll grab some out of the tap and test it today.

    I only cared about what was IN the pool
    * 18.5 K Gallon, 8ft deep, IG, Pebble Radiance * Pentair VS 3050 Pump w/420 Cartridge Filter
    * Blue Square Q-360 In-floor Cleaning System * UltraPure UPP25 Ozone Generator
    * Pool startup: 09-04-2012 * TF-100 Test Kit

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    kkendall's Avatar
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    Re: Adding calcium

    Got a speed stir today so I gave it a test drive on the CH test

    Out of the tap - 130
    Out of the pool - 150

    I gave each test two extra drops to see if any further color change could be seen.
    * 18.5 K Gallon, 8ft deep, IG, Pebble Radiance * Pentair VS 3050 Pump w/420 Cartridge Filter
    * Blue Square Q-360 In-floor Cleaning System * UltraPure UPP25 Ozone Generator
    * Pool startup: 09-04-2012 * TF-100 Test Kit

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    kkendall's Avatar
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    Re: Adding calcium

    After getting Leslies test results, and seeing his test methodology, I liked MY number better. He said he didn't have any Hardness Plus, so I went to a different store and picked up an 8 lb tub.

    Over the course of a week or so, I began adding it. Dissolving some in a bucket of pool water and pouring it back in at various places. I continued to test the CH and wasn't seeing much difference - after all 8 lbs were added, I saw the CH somewhere around 190.

    Then yesterday, I tried mixing in 2 drops of R0012 right after the 20 drops of R0010 then proceeded with the test. It now reads about 200 to 210.
    * 18.5 K Gallon, 8ft deep, IG, Pebble Radiance * Pentair VS 3050 Pump w/420 Cartridge Filter
    * Blue Square Q-360 In-floor Cleaning System * UltraPure UPP25 Ozone Generator
    * Pool startup: 09-04-2012 * TF-100 Test Kit

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    Re: Adding calcium

    Stop where you are. It will continue to increase slowly over an extended period.

    I gave each test two extra drops to see if any further color change could be seen.
    To avoid confusion, drops based test are complete when no further color change can be observed. In other words, when the last drop produces no color change, that is the end of the test. Subtract that last drop and the result is your test result.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    kkendall's Avatar
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    Re: Adding calcium

    Right - I always add a couple extra drops and observe the color as I do it make sure there is no further color changes (and subtract them from the end count)
    * 18.5 K Gallon, 8ft deep, IG, Pebble Radiance * Pentair VS 3050 Pump w/420 Cartridge Filter
    * Blue Square Q-360 In-floor Cleaning System * UltraPure UPP25 Ozone Generator
    * Pool startup: 09-04-2012 * TF-100 Test Kit

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