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Thread: Replace old DE Filter Grids or buy new filter?

  1. Back To Top    #1

    Join Date
    Jun 2010
    Location
    Arlington, TX
    Posts
    55

    Replace old DE Filter Grids or buy new filter?

    Hi,

    I have a 48 square foot DE filter that is probably at least 25 years old. I think it is a Pac Fab Nautilus Stainless D.E.

    IMG_20180209_122117.jpg

    I do almost all pool maintenance myself - but the one thing I pay to have done is the cleaning of the DE Filter once a year. The manifold is cracked, and the grids need to be replaced. I have three options:

    1) Pay $500 for new grids and manifold installed.
    2) Pay $1100 for a new Pentair FNS Plus 48 square foot installed with a new "push/pull" valve.
    3) A friend of mine just filled his pool in with dirt and is looking to get rid of his 15 year old Pentair/Aquatech NS/FNS-60. I can buy it for $50. He says the grids are all in good shape. I am asking how much it will cost to have it installed - I am not considering doing this myself.

    Questions:

    Would it be dumb to put $500 into such an old filter?

    Do I have to replace my existing multiport valve if I replace the filter?

    My filter pump is a two speed - I run it on low speed practically all the time. How will the performance (pressure/flow) change going to a 60 square foot DE filter?

    Thanks,
    Robert
    27,000 Plaster IG Pool
    DE Filter, 48 sq ft
    Pentair WhisperFlo two speed 1 HP Pump

  2. Back To Top    #2
    JoyfulNoise's Avatar
    Join Date
    May 2015
    Location
    Tucson, AZ
    Posts
    14,225

    Re: Replace old DE Filter Grids or buy new filter?

    Get a Pentair QuadDE filter if you plan to stick with DE. They are A LOT easier to maintain than the spiral grid style FNS. My Quad is oversized for my pool volume so I never backwash. I simply tear it down and do a full clean out once per year. Takes about 2-3 hours on a Sat. Easiest filter to maintain in my opinion.
    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

    Join Date
    Jul 2013
    Location
    DFW Texas
    Posts
    31

    Re: Replace old DE Filter Grids or buy new filter?

    Robert, I have that filter and considered ditching it because it's old and the grids needed to be replaced. But I don't need a new manifold and we had to replace the pump this year, so I figured we'll keep it for now. If you're faced with paying someone $500 to put that stuff in vs. a newer, easier filter to deal with - I would go with the new filter. As for a used one, you're the one who knows your bank account. But I would prefer to have a new one because of the design improvements over what you (and I) now have.

  4. Back To Top    #4

    Join Date
    Jun 2010
    Location
    Arlington, TX
    Posts
    55

    Re: Replace old DE Filter Grids or buy new filter?

    Thanks for the replies.

    My current filter never requires backwashing and only gets cleaned once a year (usually in January). I pay someone $100 to clean it once a year - saves me the hassle. So I am not sure what design features of a newer filter would benefit me. I plan to continue to pay for this once a year service. My main concern about replacing the grids is that if the clamp or tank fails (begins to leak) within a year I will wish that I had paid the extra money to get a new filter.
    27,000 Plaster IG Pool
    DE Filter, 48 sq ft
    Pentair WhisperFlo two speed 1 HP Pump

  5. Back To Top    #5

    Join Date
    Jun 2010
    Location
    Arlington, TX
    Posts
    55

    Re: Replace old DE Filter Grids or buy new filter?

    Option 3 in my original post is by far the cheapest. I can buy a used Pentair/Aquatech NS/FNS-60 for $50. All of the grids have been recently replaced. I am asking how much it will cost to have it installed - I am not considering doing this myself.

    My existing Nautilus stainless steel filter is 48 SF. The used 60 SF NS/FNS-60 filter is 60 square feet. Will the 60 SF filter work in my system with 1.5 inch plumbing and Pentair WhisperFlo two speed 1 HP Pump? I run the pump on its low speed practically all the time. Can I re-use my existing 1.5" multiport valve or will I need to replace it?

    Here is another picture showing my current setup.
    IMG_20180209_122203.jpg

    Thanks,
    Robert
    27,000 Plaster IG Pool
    DE Filter, 48 sq ft
    Pentair WhisperFlo two speed 1 HP Pump

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