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Thread: Prefilter the water before it hits the main filter/pump

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    Prefilter the water before it hits the main filter/pump

    Just got my first pool installed....a 24' above ground. It came with the best pump and filter system teddy bear sells for this. Not real familiar with how it works yet but it has DE fingers and is supposed to keep the water real clear. That is gonna be a challenge for the filter....and got me to thinking it would be a great idea to put a prefilter in line.....between the leaf/lint trap and the pump filter. Ideally it would be unpowered....just a cannister that hold a cheap filter good for, say 50 micron size particles. Weed all that **** out before the water hits the DE filter which supposedly is good for particles down to 5 microns. Pluses if the cannister is clear so I can see whats going on in there. Just switch out the filter when it starts looking crappy. Would plan on doing that every couple of weeks if the filters were cheap enough.
    So I looked on the web for such an item and cannot find one. Due to my inexperience in what I am doing, ended up looking thru 160 pgs of ebay ads of pool pumps and filters and finding no satisfaction.
    Guess I could build what I am thinking of. Get some cheap filters (like Intex "B"?) and build a cannister to fit, but I'd rather buy one ready made.
    Anyone know of such a thing and where to go get it? Thx!

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    Join Date
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    Re: Prefilter the water before it hits the main filter/pump

    Maybe add a small sand filter inline before your DE filter?
    18x36 Vinyl In-ground w/roman ends 27,400G, Hayward 3/4hp with 300# sand filter. Hayward heat pump heater

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    No P in my ool's Avatar
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    Re: Prefilter the water before it hits the main filter/pump

    I think if you went to the pool store and got some skimmer socks you would accomplish your objective a lot easier and cheaper.
    21' Leslies Beachland Ag Pool, 10,000 gallons, professionally installed (best money I ever spent) Hayward 16" sand filter w/Pentair two speed pump Fafco 4x20 solar heater,Aqua Trol RJ. Borates added. Hard plumbed.

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    Re: Prefilter the water before it hits the main filter/pump

    I think if you went to the pool store and got some skimmer socks you would accomplish your objective a lot easier and cheaper.
    Good advice.

    I know this doesn't address your question but having your water chemistry correct will do more towards keeping your pool clear than adding a filter. If you get algae or something else to cloud your water, the filter can often be irrelevant.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Richard320's Avatar
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    Re: Prefilter the water before it hits the main filter/pump

    I have a knee-high nylon stretched over my skimmer basket for just that reason. It loads up with looks like dryer lint - soggy dryer lint - in a couple days. Cleans off pretty much the same as the dryer screen.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    JasonLion's Avatar
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    Re: Prefilter the water before it hits the main filter/pump

    There really isn't any point in using anything fancier than a skimmer sock as a pre-filter. It will simply increase your costs and maintenance work without helping anything.
    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

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    Re: Prefilter the water before it hits the main filter/pump

    Thx for all the replies. I did drive out to a few stores today looking for what I'd envisioned. Ended up at Leslie Pools and talked to their install guy. He basically said what the consensus of your opinions amounted to....putting in my ideal prefilter would be unnecessary.....so I bought a pkg of their 'debris shield' socks and will try those installed on the trap screen. If I find a woman willing to give up a pair of scrap panty hose I might try that, too. Thx again all.

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    Richard320's Avatar
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    Re: Prefilter the water before it hits the main filter/pump

    Quote Originally Posted by tallpall
    Thx for all the replies. I did drive out to a few stores today looking for what I'd envisioned. Ended up at Leslie Pools and talked to their install guy. He basically said what the consensus of your opinions amounted to....putting in my ideal prefilter would be unnecessary.....so I bought a pkg of their 'debris shield' socks and will try those installed on the trap screen. If I find a woman willing to give up a pair of scrap panty hose I might try that, too. Thx again all.
    Queen size kneehigh at Walgreens. 2 pr for a buck. Rumor has it Wallyworld sells ten packs even cheaper.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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