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Thread: Pressure Change

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    Pressure Change

    I wasn't sure if I should piggy back on someone else's thread or start a new one.

    I have a Hayward DE3620. My typical pressure over the last two years (age of the pool and equipment) been been between 12psi and 16psi, 16 being when I backwash and recharge with 80% of DE required. This year, I noticed that the norm had jumped to between 14psi and 16psi with a backwash coming at around 20/21psi. On Sunday I noticed it had jumped to about 24psi. No clue what happened, but I figured maybe it was time to clean the grids. I took to the site and to Youtube and decided I would hose down the grids in the canister without removing them. I got them basically looking new. I backwashed the filter and rinsed one more time before going to filter just to get the remaining crud out. Fired up the filter and now my new norm, all clean and not charged is 14psi. I charged it with the full 4.5 lbs. since the grids were clean and now I'm running a new norm of 17psi. Does that make any sense? Is there a possible reason for the jump in pressure? Everything seems to be working normally as far as I can tell.

    Thoughts?
    26,700 Gal., 18x36 IG pool with Vinyl. 1HP Hayward Super Pump; Hayward DE3620 Filter; Hayward SAS; TFT-100 test kit; Dolphin Atlantis Cleaner.

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    Mod Squad jblizzle's Avatar
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    Re: Pressure Change

    Only reason for the pressure to rise is if the pump is now moving more flow (doubtful) or the grids are clogged.

    Did the grids feel stiff? Was the water able to quickly drain out of them?
    I was never able to get all the DE of the grids without pulling them apart: DE Filter Cleaning Tutorial

    You may need to soak them as well. Have you read: Use and Care of DE Filters
    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: Pressure Change

    Quote Originally Posted by jblizzle View Post
    Only reason for the pressure to rise is if the pump is now moving more flow (doubtful) or the grids are clogged.

    Did the grids feel stiff? Was the water able to quickly drain out of them?
    I was never able to get all the DE of the grids without pulling them apart: DE Filter Cleaning Tutorial

    You may need to soak them as well. Have you read: Use and Care of DE Filters
    I'll be honest, I didn't think there was all that much DE on them when I opened it up. There were some clumps near the top, but the grids themselves weren't too bad. They weren't overly stiff or anything, as far as I could tell. Like I said they were almost pure whit when I was done. Is it possible that something maybe clogged the header? Not sure how that would happen as I have all my baskets in place. If it's nothing to be too concerned with then I'll just wait until the end of the season and break it down.
    26,700 Gal., 18x36 IG pool with Vinyl. 1HP Hayward Super Pump; Hayward DE3620 Filter; Hayward SAS; TFT-100 test kit; Dolphin Atlantis Cleaner.

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    Mod Squad jblizzle's Avatar
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    Re: Pressure Change

    It should not cause any issues to have the pressure a little higher.
    Odd though.
    I suppose a bad gauge is another possibility.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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    Re: Pressure Change

    I suppose a bad gauge is another possibility.
    I was thinking that as well. It's definitely a cheap piece. I'll get a new one just for the heck of it.
    26,700 Gal., 18x36 IG pool with Vinyl. 1HP Hayward Super Pump; Hayward DE3620 Filter; Hayward SAS; TFT-100 test kit; Dolphin Atlantis Cleaner.

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    Mod Squad pooldv's Avatar
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    Re: Pressure Change

    get a very fancy oil-filled one from tftestkits.net for 11 bucks.
    TFP Moderator
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    Mod Squad JVTrain's Avatar
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    Re: Pressure Change

    Quote Originally Posted by pooldv View Post
    get a very fancy oil-filled one from tftestkits.net for 11 bucks.
    Love mine!
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
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    Re: Pressure Change

    Did you happen to adjust your return eyeballs sometime before you noticed the pressure increase?
    Cheers, Peter
    20,000 gal, 52'x17' kidney shaped IG, Pebble Tec, IntelliPro P6E6VS4H-209L pump. Intellichlor IC40 SWG.
    300 sf Sta-Rite System 3 cartridge filter. Poolvergnuegen 4-wheel suction pool cleaner. TF-100 test kit.

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    Re: Pressure Change

    get a very fancy oil-filled one from tftestkits.net for 11 bucks.
    I didn't realize they sold them. I was looking on Amazon, but haven't purchased yet, so I will definitely get one from tft. Thanks!

    Did you happen to adjust your return eyeballs sometime before you noticed the pressure increase?
    Interesting that you mention the eyeball. I have the one's that are all one piece, so they don't 'lock' in place. I've found that they're rotating on their own and I have to adjust them frequently. Does that have any impact on the pressure seen on the filter gauge?
    26,700 Gal., 18x36 IG pool with Vinyl. 1HP Hayward Super Pump; Hayward DE3620 Filter; Hayward SAS; TFT-100 test kit; Dolphin Atlantis Cleaner.

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    Re: Pressure Change

    Yes, for my pool the size of the eyeball openings has a big effect on the pressure required to push water thru them. I was surprised when I first noticed the effect, but it makes sense when you think about it. Rotating the eyeball so there is less opening is just like putting a restriction in the line.
    Cheers, Peter
    20,000 gal, 52'x17' kidney shaped IG, Pebble Tec, IntelliPro P6E6VS4H-209L pump. Intellichlor IC40 SWG.
    300 sf Sta-Rite System 3 cartridge filter. Poolvergnuegen 4-wheel suction pool cleaner. TF-100 test kit.

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