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Thread: Pool Water Hardness

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    Pool Water Hardness

    [b]
    Could you tell me the best way to increase the water hardness? I have a guinite pool. Is there a cheaper way of raising the level with out buying it from the pool store?
    Rob

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    Join Date
    Jul 2007
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    Sahuarita, AZ
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    What do you mean by water hardness? It's not a term I often see around here. Why do you think you need to increase it anyway?
    My Pool:
    12K gal IG gunite with 7' raised spa, gunite waterfall, PebbleTec Caribbean Blue finish, solar heating & in-floor cleaning system

    Equipment: Sta-Rite 300' Cartridge Filter, Intellichlor IC20 SWCG, Sta-Rite 400k BTU heater, Intelliflow 4x160 main pump & Sta-Rite 3/4 hp waterfall pump, EasyTouch controlls w/ wireless controller, TF-100 Test Kit w/ salt test.

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    In the Industry

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    Please post a full set of test results, and tell us how they were obtained (pool store, your own test kit, type of test kit, etc.)

    Calcium hardness or CH is what's important in a gunite pool. Its level should be 300 or so. CH is raised with calcium chloride (calcium hardness increaser) which is not at all expensive, even at a pool store.

    You can figure out how much you need to add by consulting the pool calculator:
    http://www.poolcalculator.com/

    It's also linked from the forum homepage and lots of members have the link in their sigs.
    ~Jules~

    My pool: INDOOR 13x27 rectangular fiberglass, built ~2001, BBB, TA-60 sand filter, Hayward two speed pump (1 hp/0.33 hp), 3/4 hp booster pump for solar heater
    Taylor K-2006 test

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    Re: Pool Water Hardness

    You mentioned that even in the pool store the chemical, calcium chloride is inexpensive even at the pool store. I just spent 61 for a 45lb bucket. I was tols that I probably need more than that. My current Calcium Hardness level is 100.
    Here are my numbers that I received from the pool store.
    FAC 3
    PH 7.6
    Alk 60
    Calcium HaRDNESS 100.


    I was also told that my phospate levels were high. They told me that this is why I have had trouble getting my pool clear and free of algea. Any thoughts?
    Many Thanks!
    Rob

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    JasonLion's Avatar
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    Re: Pool Water Hardness

    DowFlake, a brand of calcium chloride, often sold as an ice melter, tends to be around $35 for a 50 lb bag if you can find it locally. I have seen it for $45 with shipping on the Internet.

    Just ignore everything they told you about phosphates. It is extremely unusual for the phosphate level to make any difference. Just maintain your FC at appropriate levels and you won't get algae.
    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: Pool Water Hardness

    Thanks! I will attempt to find it. I have a feeling I will have to buy it next winter for next season. I will try online for this year.
    Are there any posting s on this site, or another that you are aware of that talk about the phosphates?
    Rob

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    JasonLion's Avatar
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    Re: Pool Water Hardness

    Here is one recent thread with info on phosphates. There are many others, search the site for phosphates.
    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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    Guest

    Re: Pool Water Hardness

    Tetra is another brand of calcium chloride that is sold in 50 lb bags that is suitable for pool use. It comes in both flake and pellet form. the Pellet form is anhydrous (without chemically bound water) so it is a bit more concentrated. The flake is the dihydrate form, same as the calcium hardness increaser sold in the pool stores.

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    Re: Pool Water Hardness

    Rob,

    Do you have a concrete (gunite) pool?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Guest

    Re: Pool Water Hardness

    Quote Originally Posted by duraleigh
    Rob,

    Do you have a concrete (gunite) pool?
    Dave, he said he did in the very first post of this thread! (Been hitting the 'shine again? )

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