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Thread: sudden increase in suction while vacuuming and psi 0

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    supercanadian's Avatar
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    sudden increase in suction while vacuuming and psi 0

    Pretty much a novice here. 16500 gallon pool, haywood sand filter, pentiar pump only 1 skimmer and a main drain at the bottom.

    I was vaccuming tonight as per normal, pressure read on the filter 10 psi as it usually reads. I backwash it regularly and clean all the baskets 2-3 times as week, plus my pool is not near trees.

    Tonight I was vacuuming and the pool vaccum head sudden stuck to the bottom and I had a very hard increase in suction. I near the pump making some different noise and noticed the sand filter psi had dropped to zero.

    I cleaned out the pump basket to make sure it was good, primed the pump. I did notice when i was cleaning the basket it seemed like air or water was draining from the line from pump to the filter which I never recall hearing before. Anyway, after trying to vaccum again (no air in the hose) it did it again, hard suction and pump pressure read zero.

    Not sure what the issue might be. Any suggestions on where to look? I check as far as I could with my hands and don't feel any blockages in the lines, and the water level is good.
    16x32 Kidney Hayward Aqua Rite Salt Generator, Omnilogic, Tristar Vari Flo Sand Filter, Colour Logic LED, WFSD Waterfall, 250 BTU Millivolt, GVA-24 Valve Actuator TF-100 Test Kit
    Pool 1
    Pool 2
    my build

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    Richard320's Avatar
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    Re: sudden increase in suction while vacuuming and psi 0

    The pump head stuck to the floor and you got zero water flow. That's all.

    Without the vacuum, everything works fine, right?
    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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    supercanadian's Avatar
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    Re: sudden increase in suction while vacuuming and psi 0

    Thanks for the quick reply. I did run the pool without the vaccum line and head attached and it did seem to run fine. The pressure went back to 10 psi and water seemed to be flowing fine.
    16x32 Kidney Hayward Aqua Rite Salt Generator, Omnilogic, Tristar Vari Flo Sand Filter, Colour Logic LED, WFSD Waterfall, 250 BTU Millivolt, GVA-24 Valve Actuator TF-100 Test Kit
    Pool 1
    Pool 2
    my build

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    supercanadian's Avatar
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    Re: sudden increase in suction while vacuuming and psi 0

    Sorry to bump this one again, but this was perfectly normal? I am going to get new vacuum head incase mine is worn (new house/pool to me).
    16x32 Kidney Hayward Aqua Rite Salt Generator, Omnilogic, Tristar Vari Flo Sand Filter, Colour Logic LED, WFSD Waterfall, 250 BTU Millivolt, GVA-24 Valve Actuator TF-100 Test Kit
    Pool 1
    Pool 2
    my build

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    mas985's Avatar
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    Re: sudden increase in suction while vacuuming and psi 0

    You might just need a bypass. How are you connecting the vacuum and is there any way to adjust the flow to another suction port?
    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

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    supercanadian's Avatar
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    Re: sudden increase in suction while vacuuming and psi 0

    I have one skimmer, it has two holes. One of them goes or comes from the main drain (not sure of it) here is a pic of my skimmer where i put in the hose to vacuum.
    which-hole-does-the-vacuum-go-in-with-pics-t59252.html

    worries me as i never had an issue now all of a sudden i get massive suction and just want to sure i don't damage anything.
    16x32 Kidney Hayward Aqua Rite Salt Generator, Omnilogic, Tristar Vari Flo Sand Filter, Colour Logic LED, WFSD Waterfall, 250 BTU Millivolt, GVA-24 Valve Actuator TF-100 Test Kit
    Pool 1
    Pool 2
    my build

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    Richard320's Avatar
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    Re: sudden increase in suction while vacuuming and psi 0

    Quote Originally Posted by supercanadian
    I have one skimmer, it has two holes. One of them goes or comes from the main drain (not sure of it) here is a pic of my skimmer where i put in the hose to vacuum.
    which-hole-does-the-vacuum-go-in-with-pics-t59252.html

    worries me as i never had an issue now all of a sudden i get massive suction and just want to sure i don't damage anything.
    The wheels wear down and the plastic starts sagging with age. So it gets too close to the surface and on a slope transition, stuck. My vacuum head has been getting worse lately, too.
    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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    supercanadian's Avatar
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    Re: sudden increase in suction while vacuuming and psi 0

    btw mine is the triangle shaped head with brushes. I'll check and see if they've wore down. thank goodness this all seems like simple things. I'll make sure my water is not leaking out and going behind the liner too.
    16x32 Kidney Hayward Aqua Rite Salt Generator, Omnilogic, Tristar Vari Flo Sand Filter, Colour Logic LED, WFSD Waterfall, 250 BTU Millivolt, GVA-24 Valve Actuator TF-100 Test Kit
    Pool 1
    Pool 2
    my build

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    supercanadian's Avatar
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    Re: sudden increase in suction while vacuuming and psi 0

    I just wanted to update that on the way home tonight I stopped and purchased a new vacuum head as when I examined my current brush the bristles were all bent going towards one direction so I tried out the new brush and so far no suction to the bottom!

    Thanks to everyone who offered advice and insight. One of the nicest sincere group of people on any chat forum period.

    I asked around at work today to see if any of the pool owners I work with had experienced a similar issue and I got a couple of comments. One person said they had a similar issue and it turned out it was a leak causing water to puff up that area behind the liner and hence the suction. One said it was probably a worn out brush or pushing to hard. The third said it was probably a blockage in pipe. I believe they have a wager as to who is right. haha

    Glad it seems like it was the brush but just relieved it does not appear to be an expensive fix! Also I start holiday next week and wanted to ensure the pool is working perfectly for all the family days we'll be spending around it.
    16x32 Kidney Hayward Aqua Rite Salt Generator, Omnilogic, Tristar Vari Flo Sand Filter, Colour Logic LED, WFSD Waterfall, 250 BTU Millivolt, GVA-24 Valve Actuator TF-100 Test Kit
    Pool 1
    Pool 2
    my build

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