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Thread: DE pool filter problem

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    DE pool filter problem

    It seems like I have to backwash my pool 3-5 times a week. My pump stops pumping water. Once I backwash, the problem goes away, but most likely comes back the next day. When I backwash the water is clear. I add DE and the next day, and I have to backwash it again to get the water moving. I've broken down the filter multiple times. I know the filters are good because they are fairly new. What else could be my problem? I'm tired of washing away DE all the time, and I'm afraid my pump is going to burn up. Thanks!
    I have a 22, 000 gal pool/spa with a hayward pump system. It uses a DE filtration system. This is a salt water system.

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    linen's Avatar
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    Re: DE pool filter problem

    Welcome to tfp, Danflys247

    It sounds like the filter is doing it's job and it is catching debris. Having to backwash that often is typically caused by algae in the pool...though a very small DE filter on a very large pool could cause also cause it.

    What does your water look like?

    What does your pressure gauge read when the filter is clean?
    What does your pressure gauge read when the pump is off?

    Please post a full set of test results. See: http://www.troublefreepool.com/pool-...efore_you_post
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    jcowart's Avatar
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    Re: DE pool filter problem

    Linen hit the key points. Is this a new problem that just came up. If not then the filter is doing it's job but just way undersized. If it's something in the water then the filter is doing it's job and will get better once the problem is taken care of. Add your pool info to your signature so we know what your working with. Also along with a full set of numbers.
    17500 gallon Doughboy AGP, Hayward DE filter, waiting for the 1.5hp DB pump to go out.
    Learn to take the advice here and be trouble free or use the pool store's advice. "You can't do both and get very far"

  4. Back To Top    #4

    Re: DE pool filter problem

    The DE filter has been installed on this system for 10+ years. The water is crystal clear. The pressure gaug usually reads 30psi when on. This problem has been an ongoing issue for the last 6 months.
    I have a 22, 000 gal pool/spa with a hayward pump system. It uses a DE filtration system. This is a salt water system.

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    linen's Avatar
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    Re: DE pool filter problem

    What does the gauge read when the pump is off?

    What brand/model filter is it?
    What brand/model pump do you have?
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

  6. Back To Top    #6

    Re: DE pool filter problem

    Quote Originally Posted by Danflys247
    When I backwash the water is clear.
    You should be getting at least some cloudiness when backwashing due to DE coming out. The clear might indicate that your flow rate while backwashing might be insufficient. This could be due to multiple things, such as clogged skimmer, clogged impeller, clogged suction lines or clogged pump basket.

    The 30 psi indicates a problem, either with the gauge or the filter.

    When you break down the filter, is there a lot of DE inside?

  7. Back To Top    #7

    Re: DE pool filter problem

    I have no clue what brand the filter is, the motor is purex triton, the gauge reads 0 when the pump is off, everytime I clean the filtersthey are always coated in DE. After I added DE the last time, it stopped pumping and I had to backwash right away.
    I have a 22, 000 gal pool/spa with a hayward pump system. It uses a DE filtration system. This is a salt water system.

  8. Back To Top    #8

    Re: DE pool filter problem

    Do these look like what you have?


    http://www.pentairpool.com/pool-owner/p ... mp-193.htm


    http://www.pentairpool.com/pool-owner/p ... ers-61.htm

    What H.P is the motor?

    What was the pressure before you added DE?

    The grids might be scaled or otherwise clogged.

  9. Back To Top    #9

    Re: DE pool filter problem

    The motor looks about right. The filter is much bigger than the one pictured. Ill check the hp tomorrow. Before I add DE the pressure is below 20. The grids are fairly new.
    I have a 22, 000 gal pool/spa with a hayward pump system. It uses a DE filtration system. This is a salt water system.

  10. Back To Top    #10

    Re: DE pool filter problem

    The motor is 2 hp
    I have a 22, 000 gal pool/spa with a hayward pump system. It uses a DE filtration system. This is a salt water system.

  11. Back To Top    #11

    Re: DE pool filter problem

    A 2 H.P Whisperflo is a very strong pump. Probably oversized for your pool. The grids might be scaled or otherwise clogged. Perhaps the salt cell is clogged. I would check the cell and clean it if necessary.

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    Re: DE pool filter problem

    I just installed a brand new salt cell.....
    I have a 22, 000 gal pool/spa with a hayward pump system. It uses a DE filtration system. This is a salt water system.

  13. Back To Top    #13

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    Re: DE pool filter problem

    How much de are you adding into your filter?? I had a customer add 10 pounds de to a 36sq ft filter, way too much. When the directions on my pentair call for 3.6 for 36, 4.8 for a 48, and 6.0 for a 60. I know the manufacturer of the de that I sell has a chart on the back and it calls for way too much. Would be a good to figure out how many gpm your pump can move and compare that to your filter. My pentair FNS plus display says 60gpm for a 36, 90gpm for a 48, and 150gpm for a 60. What is the calcium hardness in your water and your TDS if you have the ability to determine that. I saw a customers 60sq ft grids shot in 6 months because of high calcium and improper water chemistry.

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    Re: DE pool filter problem

    I put 5-6 coffee cans of de at the start, then 3-4 after the backwash. The water is new and the water was treated initially by a professional. I'm wondering if I have calcium build up on the filters
    I have a 22, 000 gal pool/spa with a hayward pump system. It uses a DE filtration system. This is a salt water system.

  15. Back To Top    #15

    Re: DE pool filter problem

    It might be calcium scaling. Also, the grids can be damaged if acid washed before degreasing.

    Note: Some references say that it is OK to acid wash the grids. However, I avoid doing it because I think it damages the fabric, at least to some degree. If you find the grids to be scaled and want to use acid after degreasing, then go as dilute as possible. Start with a 10:1 ratio.

    Posting a full set of results will help determine the likelihood of scaling.

  16. Back To Top    #16

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    Re: DE pool filter problem

    How many sq ft is your filter? They say that 1 coffee can is around a pound. Hose the grids off completely and thoroughly then let them dry. If the are calcified over they will feel rough. Scrape it with your finger nails and see how it feels.

  17. Back To Top    #17

    Re: DE pool filter problem

    Another way to test for scaling of the grids is to pour a little vinegar on a small spot to see if it fizzes.

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