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Thread: Calcium chloride

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    Join Date
    Sep 2013
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    Seattle, WA
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    Calcium chloride

    With a new house came a new pool. I've been lurking on this site for quite a while and over the past few days was able to successfully open our pool for the first time. Following the pool school instructions with a TF-100 kit couldn't have been easier.

    According to my tests my CH level is to low (~125). Trying to source inexpensive calcium chloride in the Seattle, WA area in the summer is proving to be difficult. I found this on Amazon and I was wondering if this would work. From my reading and understanding I believe it should but without being able to find an MSDS I'm not sure of the exact composition.

    http://smile.amazon.com/gp/product/B...A3EY8IY6FYPB83

    Any help is greatly appreciated.

    Matt
    22,000 gallon in-ground plaster pool (circa 1960?) -- Sand filter (not sure year or model, older with metal housing) -- Propane heater (hope to be natural gas soon)

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    Butterfly's Avatar
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    Re: Calcium chloride

    Hi Matt and welcome to the forum

    From Pool School Recommended Chemicals:
    Calcium hardness can be raised with calcium chloride or calcium chloride dihydrate. They are available in some areas as Peladow, Dowflake, Tetra Flake, or Tetra 94, often sold as a deicer by hardware stores, and some big box stores, in colder climates. Pool stores will carry either calcium chloride or calcium chloride dihydrate under a variety of names, including Hardness Plus, Balance Pak 300, Calcium Hardness Increaser, etc. Calcium products should be spread across the surface of the deep end of the pool.
    What about the hardware stores?
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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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    Re: Calcium chloride

    Thank you for the response. I've looked through all of the surrounding Lowe's and Home Depots with no avail. The local hardware store has some de-icer but it isn't calcium chloride. Given that it is (hopefully) a one time purchase I'm going back and forth with the idea of making the trek to a pool store to find some. Not exactly top on my priority list though as it will probably be significantly more expensive.

    The Seattle area isn't exactly known for needing de-icer. When the roads get icy the whole area shuts down.
    22,000 gallon in-ground plaster pool (circa 1960?) -- Sand filter (not sure year or model, older with metal housing) -- Propane heater (hope to be natural gas soon)

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    Butterfly's Avatar
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    Re: Calcium chloride

    The Seattle area isn't exactly known for needing de-icer. When the roads get icy the whole area shuts down.
    Hey! We do the same thing!

    I have ordered online (I think from Ace Hardware) and even with paying shipping, still got it cheaper and it was delivered to my door.

    Do you know how much you need? You can use the PoolMath calculator. Button in menu bar at top of each page.

    btw, having a sand filter which will require backwashing, you will lose some CH (and other chems) with the backwashes. So, you will need to test and balance them occasionally. iow, you may need some more CH down the road.

    Good luck!
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    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.

    ~ One should not use a sledge hammer to swat a mosquito. ~

    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  5. Back To Top    #5

    Join Date
    Sep 2013
    Location
    Seattle, WA
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    Re: Calcium chloride

    Quote Originally Posted by Butterfly View Post
    Do you know how much you need? You can use the PoolMath calculator. Button in menu bar at top of each page.
    According to the calculator I need ~30 pounds (depending on the form).

    Quote Originally Posted by Butterfly View Post
    btw, having a sand filter which will require backwashing, you will lose some CH (and other chems) with the backwashes. So, you will need to test and balance them occasionally. iow, you may need some more CH down the road.
    Correct. That is why I was leaning more towards getting a 50 lb. bag rather than pool store stuff. What I've found on Amazon at $58 for 50# appears to be around the best I can find in stock for this area and/or the time of year. I'm wondering if the stuff on Amazon will work alright or if I should be wary of it since there isn't a specific MSDS available.
    22,000 gallon in-ground plaster pool (circa 1960?) -- Sand filter (not sure year or model, older with metal housing) -- Propane heater (hope to be natural gas soon)

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