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Thread: Backwash issue

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    Join Date
    Jun 2011
    Location
    Morton, IL
    Posts
    4

    Backwash issue

    At the end of last year a construction crew was digging up our sidewalk and accidentally broke our backwash pipe that was going into the storm sewer. The city came out and told us that they could not reconnect it due to EPA regulations. I called a plumber and it was going to cost several thousands $ to have the pipe re-routed to the waste sewer. I called our pool guy and he suggested that we connect the backwash to an inground sprinkler system. On the first attempt I connected one sprikler at the point the construction guys broke the pipe. The backwash pipe coming out of the sand filter immediately came apart and start spraying water every where. I then extended the pipe another 50 feet and added 3 more sprinklers. The pipe comes apart on occasion, but the biggest concern is that when I run the backwash, the pressure spikes to 30 psi and nothing appears to be happening in the site glass. I let the pipe "blow" off the filter and could immediately see results in the site glass. I called the pool guy back and he said as long as the sprinklers are working the filter is backwashing. I don't buy it. I have a couple questions...

    1. Am I wrong?
    2. Does anyone know how many sprinklers (approximately) I would have to connect for a 1.4 horsepower pump?
    2. Is there a better way to do this?
    36,000 gallon inground pool
    Sand Filter
    1.4 horsepower pump

  2. Back To Top    #2

    Join Date
    Jun 2011
    Location
    Morton, IL
    Posts
    4

    Re: Backwash issue

    I forgot to add that this is a 36,000 gallon IG and has a Hayward Sand Filter
    36,000 gallon inground pool
    Sand Filter
    1.4 horsepower pump

  3. Back To Top    #3

    Re: Backwash issue

    To get a good backwash, you need about 15 gpm per square foot of filter surface area. The sprinklers are causing too much resistance. The pressure when backwashing should be less than 10 psi.

  4. Back To Top    #4
    Melt In The Sun's Avatar
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    Oct 2009
    Location
    Tucson, AZ
    Posts
    3,899

    Re: Backwash issue

    You're just going to clog the sprinkler heads even if you do get it working. I don't think it's really a solution.
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
    TF Test Kits -- PoolMath -- Pool School
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  5. Back To Top    #5

    Join Date
    Jun 2011
    Location
    Morton, IL
    Posts
    4

    Re: Backwash issue

    Thank you for the quick feedback! What would you suggest for a solution? Should I just bit the bullet and pay a plumber to hook it up to the waste sewer?
    36,000 gallon inground pool
    Sand Filter
    1.4 horsepower pump

  6. Back To Top    #6
    dmanb2b's Avatar
    Join Date
    Apr 2009
    Location
    NY
    Posts
    3,728

    Re: Backwash issue

    Get a cheap 50-100ft backwash hose and water the lawn...that's what I do
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

    Pool School, TFTestKits, Pool Calculator

  7. Back To Top    #7

    Join Date
    Jun 2011
    Location
    Morton, IL
    Posts
    4

    Re: Backwash issue

    Thank you so much! Did not even know those existed.
    36,000 gallon inground pool
    Sand Filter
    1.4 horsepower pump

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