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Thread: Filter Change

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    Filter Change

    I would like to change my current filer (cartridge) to a sand filter. I am starting my 4th year with the current cartridges and they need to be replaced so I figured that now is as good a time as any to switch. The cleaning isn't so bad its just putting the filter back together is a PIA - came home one day and found I lost a couple thousand gallons of water cause the top of the filter wasn't positioned perfectly & this was 2 weeks after I cleaned the cartridges - never the less I want to switch to a sand filter
    Here are the pools stats:

    Pentair Clean & Clear Plus 240
    Pentair Whisper Flow 1.5 HP - Single Speed
    18,000 Gal Gunite Pool
    Run the pump 10 hours /day

    The current filter is rated for 90 GPM does the new filter have to meet this?
    Current filter is 2" PVC any problem going to 1.5" connections on the new filter?
    Any filter recommendations?

    Thanks for any help you can provide
    SW Connecticut
    18,000 Gal Freeform
    Gunite/White plaster

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    JasonLion's Avatar
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    May 2007
    Location
    Silver Spring, MD
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    Re: Filter Change

    Yes, 90 GPM or higher is a good place to start. A 1.5 HP WhisperFlo can move a lot of water. A Pentair Triton II TR-100 is a good choice, though really sand filters have been around for so long that they are all fairly similar and you can't go wrong as long as you get one that is large enough.

    If the connections are 1.5" that is alright. I think you will discover that if you get a filter designed for that flow rate that it will have 2" connections.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. Back To Top    #3

    Re: Filter Change

    Thanks for the fast reply - I was considering a Hayward filter that was rated for 75 GPM - too low?
    SW Connecticut
    18,000 Gal Freeform
    Gunite/White plaster

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Filter Change

    The 75 GPM model will probably work more or less. The flow rate is going to exceed 75 GPM, and so it won't filter as well as it could and you run a risk of it getting channelized. Moving up to the next larger size would be a much better choice in the long run.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  5. Back To Top    #5

    Re: Filter Change

    Thanks for your help - I'll look into both the Pentair & Hayward @ the required size
    SW Connecticut
    18,000 Gal Freeform
    Gunite/White plaster

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    Join Date
    Mar 2007
    Location
    Coastalish 'down easter'
    Posts
    4,160

    Re: Filter Change

    A little impatient, J? :P

    Jason has said ~ what I did to your post on PF

    Please don't get me wrong, I think it's great that you're looking in different places for advice to get your pool 'perfect', I just noticed that this was a very similar question to one I had answered an hour ago

    "Upsizing the filter never hurts"
    Luv& Luk
    -Ted

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

    POOL SCHOOL, TF Testkits, Jason's Pool Calculator, CYA vs. cl chart, (Just a few DARNED handy links!)

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