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Thread: Unexplainable Filter Pressure Spike

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    Unexplainable Filter Pressure Spike

    Iíve never owned a pool until now. We renovated the pool body last year (fall 2014); tested and ran the equipment; and then winterized everything. Since opening this year, weíve had trouble with the filtration.

    First, the pump kept losing prime, so we replaced the check valve and hair basket, which resolved the issue. Now, the filter pressure spikes to over 30 psi within a few hours of operation. Backwashing or even a complete filter cleaning drops the pressure, but then it creeps back up. Typically it runs between 15 and 22 psi. We get a lot of leaves, but I manually skim and clean the baskets daily. The water is currently cloudy, but when operating properly, it's crystal clear.

    Aside from the new parts mentioned, we replaced the timer, and added Polaris robot. Everything else is original.

    Iíve talked to my pool guys about replacing the DE Nautilus NS-36 filter to a Hayward C4030 cartridge system. But Iím wondering if that will address the problem. Any thoughts on what else might be causing this?

    Note that the filter pressure goes up independent of the Polaris.

    This is an in-ground, 35,000 gallon pool and spa set up.

    Many thanks for any and all advice.
    ~Jason
    Washington, DC
    Amorphously Shaped In-Ground Pool with Spa and Small Spillway Waterfall
    Originally built sometime in the 1970s and renovated in 2014

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    Mod Squad kimkats's Avatar
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    Re: Unexplainable Filter Pressure Spike

    There is something in your water. Your filter is doing its job so the pressure is going up.

    If you want to take control of your pool you really need to get your own test kit. It will save you SO much money and time in the long run. Look in my siggy for the two test kits we use and love. The TF-100 is the best bang for the buck.

    Once you get your test kit let us know and we can walk you through the tests.

    Kim (yeah I know the pool store will test your water for free BUT is it really free if they have you buying all kinds of stuff that may not work?)
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Mod Squad JVTrain's Avatar
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    Re: Unexplainable Filter Pressure Spike

    When you clean the filter by taking it out, does there appear to be alot of debris on the filter? Is there a visible source of the pressure rise?

    I would suggest getting a Recommended Test Kits and posting test results. When you have a filter pressure rise, your filter is doing its job, removing particulates, which cartridge filters are particularly good at (pun intended ) You likely have a pool water chemistry issue, leading to more particles in the pool, leading to a dirty filter.

    Also... Welcome to TFP!
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

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    Richard320's Avatar
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    Re: Unexplainable Filter Pressure Spike

    Welcome

    I wouldn't do even consider replacing that filter. Sounds like it's working great!

    It's filtering out the cloudiness and clogging up, just the way it's designed. That cloudiness is dead bleached algae carcasses. The problem is that algae reproduces extremely fast, so even if you kill and filter out half, in a few hours, new algae has grown to replace it. You need to stop the endless cycle by killing the algae off faster than it can reproduce until you've killed it all.

    Take the money you would waste on a cartridge filter and invest it in a TF100 with the XL option and a whole bunch of bleach. You'll have a few hundred left over to spend on patio furniture, pool toys, beer, and little umbrellas for your foo-foo tropical cocktails.

    Read some of these threads. See the swamp to pool conversions. Your pool is nothing like those, but it will be if you don't take action soon. Don't go to the pool store and waste money on snake oils and powdered shock.
    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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    Re: Unexplainable Filter Pressure Spike

    Thanks for this feedback Kimkats, JVTrain, and Richard320. I really appreciate it.

    Since I posted this morning and have returned from some meetings, my filter spiked and has sprung a leak. Be that as it may, I think I understand the point you're all making: my water is cloudy and the filter is doing it's job.

    I actually own a test kit. What's crazy is that I learn best when I'm watching someone do something and explaining the whys and what-fors along the way. Maddeningly, when I speak to pool company reps and pool supply stores, they consistently say, "oh, just follow the directions" and "it's easy!" I'm no idiot, but I'm stumped.

    At this point, I am going to review the threads Richard320 suggested. I'll also get the pools guys out here to fix the new leak. I'l wait to replace the filter. And I'll get some chlorine and see if I can figure out my Taylor K-2006 test kit.

    If there's anyone in DC who'd be willing to mentor me a little, I'm be much obliged.

    - - - Updated - - -

    Thanks kimkats. My pool is currently a little cloudy; not much more than that. I'll post a photo in a bit.

    - - - Updated - - -

    There's come visible debris, but not tons. I suppose is possible theres something in the pump wheel that's clogging the system. Getting into that is going to be a bear and probably beyond my physical limitation at this point in my life.
    ~Jason
    Washington, DC
    Amorphously Shaped In-Ground Pool with Spa and Small Spillway Waterfall
    Originally built sometime in the 1970s and renovated in 2014

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    Richard320's Avatar
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    Re: Unexplainable Filter Pressure Spike

    Taylor has how-to videos. https://www.taylortechnologies.com/p..._slideshow.asp

    Just scroll down the menu below the video screen to find your kit and the test you want to watch.
    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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    Re: Unexplainable Filter Pressure Spike

    So I just spoke with a different pool company guy. He thinks the DE membrane is clogged snd recommended a whole cleaning process (Dawn dish soap and then muriatic acid). This makes sense to me, especially because we had heavy pollen this year, but I wanted to get your input. Anyone have experience thoroughly cleaning a DE filter and, separately, what's the life expectance of these DE filters?
    ~Jason
    Washington, DC
    Amorphously Shaped In-Ground Pool with Spa and Small Spillway Waterfall
    Originally built sometime in the 1970s and renovated in 2014

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    Richard320's Avatar
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    Re: Unexplainable Filter Pressure Spike

    DE Filter Cleaning Tutorial

    I have no clue what the life expectancy of a grid is. Mine are over five years old and look great.
    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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    Mod Squad kimkats's Avatar
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    Re: Unexplainable Filter Pressure Spike

    Jason, I watched a couple of "How to clean a DE filter" videos. You will need to find the one that fits YOUR model. It does not look hard. You can also do a search here at TFP and there are all kinds of posts about it. I bet if you found a member that has your model or close to it they would help you with how they did it.

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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