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Thread: Suction side issue?

  1. Back To Top    #1

    Suction side issue?

    I'm new to the forums and after searching, I am still unable to troubleshoot my problem.

    I can't seem to get my pool vacuum working to what it was a few weeks ago. When I have the water feature on, I get a 15psi and the vacuum doesn't move at all (tiny vibrations in the hose). When the water feature is turned off, I get a 20psi and the vacuum begins sucking, but very little. I don't see any air bubbles in the return side.

    I found a leak to my water feature and have fixed that issue. I have looked at and replaced all the o rings (vacuum leaf basket, leaf basket and pump). I also looked at the impeller and it didn't look like there were any obstructions.

    Any other thoughts for helping me troubleshoot this issue? The pump is older (5+ years) and the sand in the filter hasn't been replaced in a few years either (5 years).

    Thanks and sincerely!
    Newbie!

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
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    37,879

    Re: Suction side issue?

    Welcome to TFP!

    What kind of pool cleaner do you have? Especially, is it a suction side cleaner, pressure side cleaner, or does it run off of a booster pump? Also, could you tell use a bit more about your pool? How many skimmers, how many returns, main drain or not, etc?
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. Back To Top    #3

    Re: Suction side issue?

    Thanks for the reply. I have a Barracuda G3 cleaner and the hookup is on the side of the pool (a foot under the water). There is one skimmer, two returns, a main drain....

  4. Back To Top    #4

    Re: Suction side issue?

    Any other thoughts on this? Would it be worthwhile seeing if the suction line has anything stuck inside it by switching my pump to 'recip'?

  5. Back To Top    #5
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
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    11,482

    Re: Suction side issue?

    Had the cleaner worked at one point?

    Is the filter pressure higher or lower than when it was working?

    Have you tried cleaning the filter?
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

  6. Back To Top    #6

    Re: Suction side issue?

    The suction line isn't clogged if you have 20psi. It sounds like the diaphragm has a rip in it. There is a yellow or white rubber piece inside of the vacuum. You need to disassemble the vacuum. This is incredibly simple. There is just a few things to unscrew by hand.

  7. Back To Top    #7

    Re: Suction side issue?

    Yeah, the cleaner had been working. I haven't cleaned the filter...plenty of backwashing, but haven't cleaned the filter.

    You think it's the diaphragm? That would be great. I took the vaccuum apart last week and didn't notice anything, however, my pool sees plenty of debris, so it is possible.

  8. Back To Top    #8

    Re: Suction side issue?

    make sure when you check the diaphgram, that you check underneath the plastic ring that is around the base. It is very common for there to be a rip there. What does the filter pressure run at when everything is working fine? Does the vacuum move when you are backwashing? Does water come out while your backwashing?

  9. Back To Top    #9

    Re: Suction side issue?

    I checked the diaphragm tonight and it is ripped. Hopefully this well help my issue. When everything is working my psi is between 15 - 20. Water does come out when I backwash and I can't recall if the vacuum confronts to work. I believe it does.

  10. Back To Top    #10

    Re: Suction side issue?

    the diaphragm is the issue

  11. Back To Top    #11

    Re: Suction side issue?

    Bingo. That was the issue. Thank you for your help!

  12. Back To Top    #12

    Join Date
    Jan 2010
    Location
    Spring Texas
    Posts
    44

    Re: Suction side issue?

    All I have a barracuda G7 with the same problem, great suction but it only works 10 seconds then tapers off and stops. Could I have the same diaphragm problem?
    20000 gal in ground Pentair Screenlogic 2 ez-touch 4
    Teledyne heater Compupool 40k Salt generator
    Pentair VS pump Hayward 4025 Cartridge Filter
    12 person Spa The Pool Cleaner robot
    lot of bushes and trees close to the pool

  13. Back To Top    #13

    Join Date
    Jan 2010
    Location
    Spring Texas
    Posts
    44

    Re: Suction side issue?

    Sorry it is a barracuda x7
    20000 gal in ground Pentair Screenlogic 2 ez-touch 4
    Teledyne heater Compupool 40k Salt generator
    Pentair VS pump Hayward 4025 Cartridge Filter
    12 person Spa The Pool Cleaner robot
    lot of bushes and trees close to the pool

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