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Thread: DE Powder/Dirty Water Going into Pool

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    DE not completely coating filter grids

    D E is only sticking to the top 1/3rd my filter grids. I have an American Products Titan CM filter, 48 sq feet, (Pool holds 22,000 gals). Water was cloudy with DE and green. Some grids torn, so replaced them all. Small hairline crack on manifold - replace that too. Added new o-rings as well. I vacuumed the pool, cleaned the new grids, vacuumed again, but still have green water with DE in it. Again - when I check the filter only the top 1/3 of the new grids is coated with DE (and seems thicker than normal). I am lost now, have you any suggestions?

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    WestSidePool's Avatar
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    Re: DE not completely coating filter grids

    What's your process for adding the DE to the filter?
    Do you just dump the dry powder directly into the skimmer, are you mixing it with water (to make a slurry) first then dumping it in?
    Eric

    IG 17x33 Grecian - Vinyl Liner (21k gallons), Hayward Pro-Grid DE 4820 filter, Hayward Super Pump, CompuPool SWG CPSC36, TF-100 Test Kit

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    DE Powder/Dirty Water Going into Pool

    I merged these topics because they're the same issue. Bama

    Can you help me figure out why all of the DE is getting back into my pool? I have a 22,000 gal pool with an American Standard Titan CM filter - 48 square feet. Some filter grids were broken so I replaced all of them. Also replaced the top manifold and the various O-rings (1 on standpipe, 2 on multi-port valve). After cleaning and vacuuming and replenishing the DE, the filter seems to work OK, but after a few days I can see the DE back in the pool (and when I open the filter there is hardly any DE sticking to the grids). Pump is working OK, plenty of suction at skimmer, drain is functioning, no leaks that I can see. When the filter shuts off, I see the dirty water draining back in through the returns and through the bottom drain. Please offer any suggestion, I don't know what else to replace - the multi-port valve? Pump?

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    Mod Squad JohnT's Avatar
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    Re: DE Powder Going into Pool

    If water is draining coming back through the drain, it's going to carry some DE with it. Is your pump basket completely full of water with no air bubbles when running? Air can compress in the filter and then force water back through the pump when you shut down.
    TFP Moderator
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    Re: DE not completely coating filter grids

    I do make a slurry mixture that I pour into the skimmer. I did notice last night that when the pump shuts off, the dirty filter water is coming out from the return lines and from the drain. Do you know what would cause this?

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    Dirty water seeping back into pool

    When the pump turns off, dirty water (with DE) seeping back into pool through the return lines and through the main drain. So what might be causing the filter to push that stuff back in? Is there some sort of an air leak that is compressing the air in the filter after is turns off?

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    Richard320's Avatar
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    Re: Dirty water seeping back into pool

    You could have air trapped in the filter. Crack the air bleed when it's running. If there's air, it will hiss and then water will start coming out. You probably also have a bad check valve in your plumbing.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    Mod Squad jblizzle's Avatar
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    Re: Dirty water seeping back into pool

    Is this the third time you asked the same question?

    Do you have an air valve on the top of your filter? If so, does air come out when you open it? The likely scenario (which I know someone already asked you about) would be air entering the filter (see any bubbles in the pump) and then compressing and when the pump turns off the compressed air pushes the dirty water back out.
    Jason, TFP Moderator
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    Re: Dirty water seeping back into pool

    Hi Jason, I guess I am just trying to rephrase the problem as I rule out other issues. It seems that the real problem is air getting into the filter. Can you suggest a way to diagnose and ultimately repair an air leak?

    Thanks

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    Mod Squad jblizzle's Avatar
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    Re: Dirty water seeping back into pool

    Air enters the system on the suction side ... thus you normally can see the air bubbles in the pump basket.

    If you see bubbles or the basket is not completely full, you can run a water hose over all the connections on the suction side and if you can get the air to go away, then you found your leak. Check the the drain plugs on the bottom of the pump. And make sure the pump lid o-ring is lubed and not leaking.

    It can be hard to find the leak ... and you have not confirmed for us that there is air in your filter yet by opening the vent at the top.
    Jason, TFP Moderator
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    Re: Dirty water seeping back into pool

    I am going to check for those leaks now. I did have air in the filter yesterday.

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    Re: Dirty water seeping back into pool

    Hello Jason. This is difficult to diagnose. No air in the filter, just water. Cannot see bubbles in the basket. Poured water over all the possible connections and no air leaks detected. There is one issue that may have a connection. Part of the pipe is cracked that connects to the backwash drain. No air leaks around that are when the pump is running, but when I pull the valve up to backwash the water is leaking. Could that be contributing to my problem?

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    Mod Squad jblizzle's Avatar
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    Re: Dirty water seeping back into pool

    Doubt it and that is closed off when not backwashing.

    Posted with Tapatalk ... sorry if I sound short ... hate typing on phone
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: Dirty water seeping back into pool

    Thanks again Jason. Will look at this again in the daylight tomorrow, there has to be an air leak someplace, right?

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    Mod Squad jblizzle's Avatar
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    Re: Dirty water seeping back into pool

    If you see air in the pump, or in the filter, or in the pool returns, then there is a leak. You last post said there was no air in the filter? Maybe it just needed to be purged after a cleaning or something? When you turn off the pump, does the water drain out of the filter? ... it should not
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: Dirty water seeping back into pool

    I had the same issue. It was caused by a failed check valve. The water in my solar system would flow back through the filter carrying DE back into the pool from the main drain. A new check valve....problem solved.
    chiefwej
    Tucson, AZ
    16x36 rectangular (19k) Pebble Tec play pool/spa, Pentair Intelliflo VS 011018, Super II 2hp (spa), Aqua Rite T-15 SWG, Pro Grid 60 DE, Hayward H400 & Heliocol Solar heating, A&A infloor system, fill water w/high CH and TA, 50 ppm borates,TF-100 test kit

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    Re: Dirty water seeping back into pool

    Where is the check valve usually located?

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    Mod Squad jblizzle's Avatar
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    Re: Dirty water seeping back into pool

    Do you have solar?

    The check valve would be right after the filter ... maybe post a picture of you equipment pad so we can see what you are working with. Many setups do not have check valves.

    Posted with Tapatalk ... sorry if I sound short ... hate typing on phone
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: Dirty water seeping back into pool

    No Solar. My filter is about 15 years old, I don't see anything that looks like a valve attached to the pipes coming out of the filter. Probably does not exist. Will look again tomorrow in the daylight.

    Thanks again Jason
    _____________________________
    22,000 gal Anthony pool, American Standard DE filter @ 48 sq ft., No Heater any more.

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    Re: Dirty water seeping back into pool

    My check valve was between the pump and the filter. In fact it was right above the pump.
    chiefwej
    Tucson, AZ
    16x36 rectangular (19k) Pebble Tec play pool/spa, Pentair Intelliflo VS 011018, Super II 2hp (spa), Aqua Rite T-15 SWG, Pro Grid 60 DE, Hayward H400 & Heliocol Solar heating, A&A infloor system, fill water w/high CH and TA, 50 ppm borates,TF-100 test kit

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