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Thread: 7000SXT 1.05" vs 32mm distributor pipe

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  1. #1
    DIY Junior Member midorix's Avatar
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    Default 7000SXT 1.05" vs 32mm distributor pipe

    Here's my data:

    3,400 sft home, 4.5 baths
    4 people (two are 13 and 9 yo)
    municipal water
    1.5" main copper water line

    hardness 15gpg
    iron none
    manganese none
    PH 7
    TDS 550ppm
    sodium 101ppm
    chlorine 0.5ppm
    SFR 12gpm (7 gallon container took 35 seconds to fill)

    I know I want to get Fleck 7000SXT, primarily due to my 1.5" main copper water line and some of the feedback I've read.

    Question: I'm debating on the size of 1.5 ft3 (48K resin) and 2.0 ft3 (64K resin) because one supplier said 1.5ft3 would be too small to use with 32mm distributor pipe as water will flow through the resin media too fast and recommend to at least go to 2.0 ft3. Another supplier said since 7000SXT comes with 32mm distributor pipe as a default so it should be ok with 1.5 ft3 (48K) system. Which is true?

    The only reason I thought of 7000SXT was due to the 1.5" main copper line that I have and would like to minimize the pressure drop. So for my situation is it better to go with:

    1) 7000SXT with 1.5ft3 (48K) with 32mm pipe
    2) 7000SXT with 2.0ft3 (64K) with 32mm pipe
    3) 7000SXT with 1.5ft3 (48K) with 1.05" pipe

    ???

    Thanks in advance for your help.

  2. #2
    Water systems designer, R&D ditttohead's Avatar
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    The 32MM or 1.05 will make no difference in flow rate on a 1.5 cu. ft. system, but... use the 32mm. The 32mm is not used by some assemblers because it saves them $2 in assembly cost. When you sell a thousdand units a year, that adds up. There is no disadvantage to using a 32MM other than the cost. My personal recommendation would be to go with a 2.5 Cu. Ft. system, this will give you great flow rate potential should you actually use multiple bathrooms at the same time, and set the system to a very efficient salt setting, 4 pounds per cu. ft. The 2.5 cu. ft. system is the largest system before the system size gets overwhelming, and the costs are still reasonable and the minimum recommeded flow rates are still ok. The 7000 is also available with 1-1/2" connectors, so the appearance of dropping pipe size can be minimized. Code does not allow a softener to drop pipe size, but it is common practice by many companies. Even the 2 cu. ft. system will be fine, I would recommend against the 1.5, it is simply too small for a larger house with multiple bathrooms from a technical standpoint. I know many peoiple install the sears unit which has a peak of 8 GPM in their mega houses and they are finwe with it. That does not make it correct.

    Let me know if you need a referral to a company that can do it correctly, I work with over a hundred companies local to you.

  3. #3
    DIY Junior Member wangtao's Avatar
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    Why not try Kinetico? Name:  2060无电2.jpg
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  4. #4
    That's all folks! Gary Slusser's Avatar
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    Kinetico!! That is a terrible choice, over priced and not near as good as the hype says it is. DIYers can't get parts when needed.

    The OP needs to buy online and install it himself or hire a plumber that will follow instructions.
    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
    That's all folks! Gary Slusser's Avatar
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    Quote Originally Posted by midorix View Post
    Here's my data:

    3,400 sft home, 4.5 baths
    4 people (two are 13 and 9 yo)
    municipal water
    1.5" main copper water line

    hardness 15gpg
    iron none
    manganese none
    PH 7
    TDS 550ppm
    sodium 101ppm
    chlorine 0.5ppm
    SFR 12gpm (7 gallon container took 35 seconds to fill)

    I know I want to get Fleck 7000SXT, primarily due to my 1.5" main copper water line and some of the feedback I've read.

    Question: I'm debating on the size of 1.5 ft3 (48K resin) and 2.0 ft3 (64K resin) because one supplier said 1.5ft3 would be too small to use with 32mm distributor pipe as water will flow through the resin media too fast and recommend to at least go to 2.0 ft3. Another supplier said since 7000SXT comes with 32mm distributor pipe as a default so it should be ok with 1.5 ft3 (48K) system. Which is true?

    The only reason I thought of 7000SXT was due to the 1.5" main copper line that I have and would like to minimize the pressure drop. So for my situation is it better to go with:

    1) 7000SXT with 1.5ft3 (48K) with 32mm pipe
    2) 7000SXT with 2.0ft3 (64K) with 32mm pipe
    3) 7000SXT with 1.5ft3 (48K) with 1.05" pipe

    ???

    Thanks in advance for your help.
    Any large tubs or 2 person showers or showers with body sprays.

    If yes, you need a much larger softener than a 2.0 cuft.
    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.

  6. #6
    DIY Junior Member midorix's Avatar
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    Quote Originally Posted by Gary Slusser View Post
    Any large tubs or 2 person showers or showers with body sprays.

    If yes, you need a much larger softener than a 2.0 cuft.
    I have one large tub that gets used occasionally (no other water hogging features in the house).
    12gpm SFR was based on this tub's faucet opening wide on both hot and cold water.
    Current peak demand is probably 12gpm as well when 3 of the showers are being used (2 gpm each) with running dishwasher and washing machine at the same time.
    My water bill show water usage of 350 gallons per day but this includes sprinkler system that's running 3 times a week which is not connected to the water softener.

    And I agree with Gary. Kinetico is a good system but it's not the appropriate price range or something I can do as a DIY softener
    I do plan to hire a plumber since I don't want to use the 1.5" copper water main line as my practice on how to sweat a copper.

    I also didn't realize the building code requirement of not reducing the pipe size, per Dittohead.
    That was my intention but I could not locate a viable 1.5" distributor water softener without going to the commercial unit with at least 90K resin which is way too large and very expensive for my application so I hope I don't get into any compliance issues with 32mm 7000sxt.

    Based on your feedbacks so far 1.5 is out so I'm now considering the 2.0.
    Based on my water usage today, that would mean it will regenerate every 10 days with 8lbs/ft3 salt setting.
    I've read that resin manufacturers recommend resin be regenerated approximately every 7 days so I thought 10 days is bit on the longer side.
    If I go to 2.5, wouldn't that be too long of a regeneration and too inefficient (larger cu ft water softener require more water and salt per regeneration?)


    Appreciate all your inputs.
    Keep it coming.
    Last edited by midorix; 08-01-2012 at 02:58 PM.

  7. #7
    In the Trades Tom Sawyer's Avatar
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    2.5 CU/FT and 32mm D tube would be my recommendation. You can go a couple weeks before regeneration if the unit is sized properly and you will not only NOT have problems, you will save on water and salt. Go 2.5 CU/FT you will be happy


    If Kinetico was a terrible choice they would not be one of the largest water filtration companies in the country.
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  8. #8
    DIY Junior Member midorix's Avatar
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    Quote Originally Posted by Tom Sawyer View Post
    2.5 CU/FT and 32mm D tube would be my recommendation. You can go a couple weeks before regeneration if the unit is sized properly and you will not only NOT have problems, you will save on water and salt. Go 2.5 CU/FT you will be happy
    Thanks.

    Looks like both you and dittohead is recommending the 2.5cu ft, as I'm assuming because of SFR, contact time, and resin bed area?

    I didn't realize Fleck 7000SXT can program and run efficiently at 4lbs salt per cu ft (as I assumed 6lbs is the lowest recommended).
    Based on my guesstimate, 4lbs salt used in 2.5cu ft system would regenerate every 9 days based on 4,500 grain needs to be softened each day (4 people x 75 gal per day x 15gpg). If I go 6lbs salt per cu ft, it then would regenerate every 11 days which may be bit too long per some industry recommendation of regenerating every 7 to 9 days.

    Would 4lb salt per cu ft pass through too much hard water or is it minimal (I've read an article that disadvantage of low salt setting is it may pass through some hard water compared to higher salt setting but it's still considered "soft" for residential applications).

    I don't mind the initial cost as I prefer to get this right once, spend the money, and hoping I don't have to replace it for 15+ years.
    Still up in the air on 2.0 vs 2.5.....
    Last edited by midorix; 07-31-2012 at 12:40 PM.

  9. #9
    That's all folks! Gary Slusser's Avatar
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    Every softener has an adjustable salt dose; some companies, like Kinetico will not tell you how to do it but... The minimum salt dose/lbs is whatever the lowest setting the control valve will allow.

    All softeners come with fully regenerated resin and can consistently get down to 0-1 grain per gallon of hardness. You only use the capacity you program the valve for total grains used over the time or gallons used between regenerations. The balance of the capacity is still in the tank; IE you have 90K and program for say 35K, the rest is still there but not used. So you only have to set the salt dose to regenerate the 35K at whatever lbs/cuft that requires and the more resin the lower that salt dose is.

    A 2.0 cuft with regular mesh resin has a constant SFR of 13 gpm. I can see your peak demand while that tub is filling being higher than that, especially as the kids get older.

    If so you will get hardness breakthrough and not much of that and your capacity is reduced while your salt dose doesn't regenerate the excess used resin and you constantly will be getting hardness in your softened water and then must do 2 back to back regenerations with no water use during or between each at the max salt dose (15lbs/cuft) for the volume of resin you have.

    And if this were my house and I were installing a softener, I'd reduce the 1.5" pipe to 1.25" by buying 1.25" plumbing connectors for the by pass valve for my control vlave, and not worry about it.
    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.

  10. #10
    That's all folks! Gary Slusser's Avatar
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    Quote Originally Posted by Tom Sawyer View Post
    If Kinetico was a terrible choice they would not be one of the largest water filtration companies in the country.
    They sell mostly to uninformed consumers but, independent dealers sell no brand name softeners and out number Kinetico dealers by a very wide margin. Plus I would say Culligan has more dealers than Kinetico does and plumbers selling their supply house brands out number both of them.
    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.

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