Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 4 of 4

Thread: Dissolving Cal Hypo

  1. Back To Top    #1

    Join Date
    May 2016
    Location
    Brandon, MS
    Posts
    34

    Dissolving Cal Hypo

    Good morning!

    I have recently been converted to the TFPC method of pool maintenance. However, I have 100 pounds of cal hypo that I just bought that I am trying to find a way to use. Over the weekend, a friend and long time pool owner told me that if you pour the shock into a five gallon bucket of water and let sit for 10 minutes, the chlorine unbinds from the calcium and other fillers. At that point you can pour just the water into the pool and throw out the remaining hard granules at the bottom of the bucket and the pool will only get the unbound free chlorine, which will not increase the calcium level.

    Can someone tell me if this is accurate? I was thinking I could use the rest of my cal hypo this way and just use bleach in the future...thanks!
    Greg - Mississippi
    18' x 36'* 23,000 gallons * Vinyl * Manual Chlorination * Pentair Sand Filter * Pentair Variable Speed Pump * Polaris 360 * TF-100 Test Kit

  2. Back To Top    #2
    JoyfulNoise's Avatar
    Join Date
    May 2015
    Location
    Tucson, AZ
    Posts
    11,597

    Re: Dissolving Cal Hypo

    Only PARTIALLY true.

    It is true that the excess calcium hydroxide and calcium oxide will sometimes cause water to scale out calcium carbonate as a precipitate (it's called "lime softening") but there will still be some CH leftover in the water. However, there is also calcium carbonate in the cal-hypo and that will increase the CH of the water mix. Since the cal-hypo is mostly hypochlorite, the amount of lime softening that will occur will be fairly limited. So I doubt you'll see much, if any, improvement in the CH of your pool water.

    Just another bit of misunderstood pool chemistry lore passed down by word of mouth....
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

  3. Back To Top    #3
    Mod Squad JVTrain's Avatar
    Join Date
    Feb 2014
    Location
    Central Minnesota
    Posts
    5,079

    Re: Dissolving Cal Hypo

    Return it and get some bleach... or some pool toys.

    Depending on your current CH level and the CH of your fill water, you could use it. CH doesn't matter much in vinyl pools but you don't want it to get above 350 ppm.

    I doubt letting the undissolved portion remain in a bucket will reduce the CH addition much at all as it's probably just undissolved cal-hypo and there's already plenty of dissolved calcium in the bucket by that point as well.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

  4. Back To Top    #4

    Join Date
    May 2016
    Location
    Brandon, MS
    Posts
    34

    Re: Dissolving Cal Hypo

    I figured as much but still wanted to check. Thanks!
    Greg - Mississippi
    18' x 36'* 23,000 gallons * Vinyl * Manual Chlorination * Pentair Sand Filter * Pentair Variable Speed Pump * Polaris 360 * TF-100 Test Kit

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •