Peak demand/Sizing help

Discussion in 'Water Softener Forum, problems, installation and r' started by fixitguy, Feb 19, 2011.

  1. fixitguy

    fixitguy New Member

    Messages:
    3
    Location:
    Ohio
    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. Tom Sawyer

    Tom Sawyer In the Trades

    Messages:
    3,312
    Location:
    Maine
    How often does the jacuzzi tub get used? But any any rate it won't hurt to go one size up.
  3. fixitguy

    fixitguy New Member

    Messages:
    3
    Location:
    Ohio
    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. Gary Slusser

    Gary Slusser That's all folks!

    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.
  5. fixitguy

    fixitguy New Member

    Messages:
    3
    Location:
    Ohio
    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. Gary Slusser

    Gary Slusser That's all folks!

    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.
  7. Tom Sawyer

    Tom Sawyer In the Trades

    Messages:
    3,312
    Location:
    Maine
    For the extra money the 2510 is going to be a better choice.

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