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Thread: Peak demand/Sizing help

  1. #1
    DIY Junior Member fixitguy's Avatar
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    Default Peak demand/Sizing help

    Hi, I plan to buy an erosion chlorinator, special mixing tank, backwashed centaur carbon filter, and softner very soon for my well system. I have run the numbers for proper sizing using the instructions/calculator on Gary's website. Below are the results, but I'm not completely sure if I need to go with a 1.0cuft unit or a a bit larger due to my peak demand SFR. Any advice/tips would be much appreciated.

    Nitrate - 0
    Chlorine - 0
    Alkalinity - 80-120
    PH - 8.5
    Hardness - 7grains (120ppm)
    Copper - 0
    Iron - 0
    Main problem is SRB (sulfur smell, black slimey film)

    3 person household, 2 1/2 bath, 1 jacuzzi tub, all other water using appliances/fixtures standard

    3 people * 60gals/day = 180 * 7 (hardness) = 1260 total grains/day
    1260 * 8days = 10080 rounded up = 11,000 total grains needed

    Using the bucket test at a bathtub, the SFR shows approx 9gpm. I realize that is not the peak demand flow rate, which is why I'm not exactly sure what size to go with. Thanks.

  2. #2
    In the Trades Tom Sawyer's Avatar
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    How often does the jacuzzi tub get used? But any any rate it won't hurt to go one size up.

  3. #3
    DIY Junior Member fixitguy's Avatar
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    Jacuzzi tub is used approx 2-3 times a week, usually at night when no other water is being used. Would you recommend a 1.25 or 1.5cuft size? Thanks

  4. #4
    That's all folks! Gary Slusser's Avatar
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    The erosion pellet chlorinator system has a 21 gpm, flow rate. A 1.0 cuft softener has a 9 gpm SFR, your tub is at 9-10 gpm alone although you don't run a tub with both hot and cold full open. The next size up would be a 1.5 cuft with a 12 gpm SFR. 2.0 has 13 gpm and probably is what your 2.5 bath house with a big tub and 3 people needs. You only get one chance to get this right, so buy the right size instead of trying to save a few bucks and getting it worng and having to live with it for 10-20 years.
    Gary Slusser Retired (= out of business)
    Click Here to learn how to correctly size or program a water softener.
    CAUTION, as of Nov 12 2013 all YouTube videos showing how to rebuild a Clack valve have an error in them that can cause damage.

  5. #5
    DIY Junior Member fixitguy's Avatar
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    Thanks Gary! I most definitely want to get this right the first time. 2.0cuft it is then. I've read that a 2.0 is pushing the limit of a Fleck 5600. Any truth to that statement? The 5600 was my first choice, otherwise I guess I'll be trying to decide between the 2510 and 7000.

  6. #6
    That's all folks! Gary Slusser's Avatar
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    The 5600 can be used on up to and including a 2.0 cuft; a 12" x 52" tank but not larger tanks.

    IMO the 5600 is a good basic valve but the 2510 SXT is a better valve and choice.
    Gary Slusser Retired (= out of business)
    Click Here to learn how to correctly size or program a water softener.
    CAUTION, as of Nov 12 2013 all YouTube videos showing how to rebuild a Clack valve have an error in them that can cause damage.

  7. #7
    In the Trades Tom Sawyer's Avatar
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    For the extra money the 2510 is going to be a better choice.

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