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Thread: Opening pool, I think I need a new DE filter

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    ntshclr's Avatar
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    Opening pool, I think I need a new DE filter

    Hey everyone,

    If you haven't seen it, I have a thread going in the Getting Started forum about opening my pool, Converting swamp to pool. To summarize, I have a ~38,000 gallon pool that has been neglected for 3 years. It has tons of debris, a ~20 year old DE filter, and old vinyl liner. I've gotten some help from that thread on getting the pool cleaned up, but I've run into a problem with my filter so I'd like to get a recommendation from the experts here.

    When adding DE into the skimmer today I noticed it shooting back into the pool through one of the jets. I opened up the filter and saw several tears in the fabric of the grids. Guy at the pool store said I would probably have to replace the grids or get a new filter, but he said if I wanted to save money I could try sewing the tears and covering them with super glue. I did that, but the DE is still coming back in the pool.

    I have a 2hp pump, 1.5" piping with 2 skimmer intakes and 1 main drain, and a 38 sq ft DE filter. I can either get new grids for the filter for $150, or I can get a new filter. So my question, is the 38 sq ft filter big enough for my set-up? If it is, then I will just get the new filter grid. If not, should I get a 48 sq ft or 60 sq ft filter? I tried reading the sticky but I'm a bit confused. I'm thinking that my piping and filter are undersized for the size of the pump and the pool. Any help is very appreciated.

    Here's my setup:

    20'x40' 40,000 gallon leafy swamp, 1980's vinyl, 2 hp Hayward pump, ancient DE filter

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    Mod Squad Bama Rambler's Avatar
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    Re: Opening pool, I think I need a new DE filter

    You can't have a filter that's too big. I'd recommend getting as big as filter as you can afford. I'd even consider switching to a sand or cartridge filter depending on what you can get the best deal on. If you want to stay with a DE filter then shop around on the internet and find the best deal.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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    ntshclr's Avatar
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    Re: Opening pool, I think I need a new DE filter

    Quote Originally Posted by Bama Rambler
    You can't have a filter that's too big. I'd recommend getting as big as filter as you can afford. I'd even consider switching to a sand or cartridge filter depending on what you can get the best deal on. If you want to stay with a DE filter then shop around on the internet and find the best deal.
    I'm not sure why you're suggesting getting a sand or cartridge filter. I thought DE provides the best filtration? Is it because the other filters are cheaper?
    20'x40' 40,000 gallon leafy swamp, 1980's vinyl, 2 hp Hayward pump, ancient DE filter

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    Mod Squad Bama Rambler's Avatar
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    Re: Opening pool, I think I need a new DE filter

    It was just a suggestion to look around and seee which fits your budget and situation.

    DE does provide filter smaller particles but that doesn't necessarily make it better. It depends on your situation. Since you have a DE you're already familiar with it and it's a good choice. Whichever you choose just get the largest you can.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    frustratedpoolmom's Avatar
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    Re: Opening pool, I think I need a new DE filter

    Since you are considering a new filter - you must take into consideration what you are dealing with (your swamp). I'd get a large sand filter. There are many, many satisfied sand users. Yes, DE offers the "best" filtration - but the maintenance is a pain and considering that you have to clear your swamp - I think Sand would be a better choice, plus you'll spend less.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Re: Opening pool, I think I need a new DE filter

    Sand would be the easiest to clear a swamp with and the easiest to deal with overall. DE is hands down the most difficult to deal with when clearing a swamp. Cartridge filters have excellent filtration that comes very close to approximating the filtering capabilities of DE. I've seen lots of sparkly pools with sand filters though.

    Yes, get the biggest filter you can manage.
    10K gallon IG gunite with waterfall; Pentair CC320P filter; WhisperFlo 2 HP pump
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    Re: Opening pool, I think I need a new DE filter

    Quote Originally Posted by 257WbyMag
    I've seen lots of sparkly pools with sand filters though.

    Yes, get the biggest filter you can manage.
    True enough on both of these! Another vote for sand
    14,000 gallon IG, Vinyl. Hayward 3/4 hp superpump, Penatair IC40 SWCG, Pentair automation, Hayward sand filter, Aqua Comfort heat pump, Hayward 400k Lo-Nox LP heater.

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    ntshclr's Avatar
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    Re: Opening pool, I think I need a new DE filter

    Thanks for the advice. I opened up my backwash valve this morning and noticed the o-rings in there were messed up. I fixed them and that seems to have stopped the de from coming back into the pool. Hopefully I'll be able to use it for few more months before it finally dies. I'm planning on shocking today now that my filter is working.
    20'x40' 40,000 gallon leafy swamp, 1980's vinyl, 2 hp Hayward pump, ancient DE filter

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    ntshclr's Avatar
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    Re: Opening pool, I think I need a new DE filter

    If I need to replace the filter once the water is clear, do you all still recommend sand over de?
    20'x40' 40,000 gallon leafy swamp, 1980's vinyl, 2 hp Hayward pump, ancient DE filter

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    Re: Opening pool, I think I need a new DE filter

    Ive had both types and have DE now.

    Its hard to beat the convenience of a large sand filter. No recharging and tons of cheap usability.

    Yes DE filters better, at the expense of time, and a a fairly low cost consumable product that must be stored handled etc.



    Id say if you maintain and religiously keep clean or have cleaner running in your pool at all times the DE filter will only need to be backwashed about twice a year its the better choice in my opinion.

    IE: in my mind this is a opening/closing pool differentiator vs open year round pool deal.....

    If you have frequent need to backwash for whatever reason- the sand filter becomes the clear economy winner delivering really good filtering with almost zero cost or maintenance for a long time.

    In Indiana I prefer a sand filter
    In Southern California I prefer DE


    Uncle Dave
    20K Gallon Gunnite pool/900 Gallon in ground Spa/2HP WhisperflowSpa
    Pentair Master temp 400/Hayward Sand Zebrite/Jandy RS-8 Aqualink/Jandy 2HP Epump
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