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Thread: Low Flow except when set to waste

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    Low Flow except when set to waste

    I have been struggling with an issue with low flow. I have a 1.5HP hayward variable flow pump followed by a S210T sand filter followed by a hayward inline chlorinator. I am experiencing the following in each of the vari-flow positions:

    Filtration - low flow and the pump chamber does not fill with water (1/2 full) but I can see a steady flow coming in
    Recirculate - same as filtration with maybe slightly more flow but still pretty low
    Waste- Full pressure with full prime and full pump chamber
    Backwash - Full pressure with full prime and full pump chamber

    I was initially thinking that the sand needed changing but since recirculate still has low flow I am thinking I have a clog somewhere in the return lines. I just bought the home/pool and it is very old with only 1 skimmer (and one working port) and 2 returns (24k gals). Any ideas?
    24k gal, IG, Fiberglass/Plaster, sand Hayward S210T, 1.5HP Vari, Hayward CL200 Inline, Installation Date Unknown (30 yrs+-)

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    mas985's Avatar
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    May 2007
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    Pleasanton, CA
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    Re: Low Flow except when set to waste

    What is the current filter pressure and what is the normal clean filter pressure?

    Have you tried to backwash the filter?

    Are all the plumbing valves open?
    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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    Re: Low Flow except when set to waste

    Current filter pressure is around 23 PSI. I have backwashed and rinsed the filter and the only valve on the system is the waste line which goes to never never land.

    Unfortunately I do not know what the clean pressure should be because I just moved into the home. The reason I initially did not think it was the filter was because the same lack of pressure occurs on the recirculate setting. Am I correct in assuming that will bypass the sand?

    Thanks in advance for your help.
    24k gal, IG, Fiberglass/Plaster, sand Hayward S210T, 1.5HP Vari, Hayward CL200 Inline, Installation Date Unknown (30 yrs+-)

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    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
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    11,490

    Re: Low Flow except when set to waste

    Yes recirculate bypasses the sand so it probably isn't a dirty filter.

    Clogs in the return line are pretty rare because the filter prevents it most cases.

    The other thing that could be a problem is a failed check valve. Do you have any check valves? If the flapper breaks off, it can sometimes clog the return line.

    A picture of the pad equipment might help as well.
    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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    Re: Low Flow except when set to waste

    I don't know if this could be your issue or not but last night I took my sand filter apart which is intex brand and mine has a screen cover on the bottom of the valve assembly and it was plugged with debri and grass that had gotten past my strainer basket and through the system. I had low flow before but now I have a vortex circulating pool again.
    18' x 52" Intex Ultra Frame, Intex Sand filter 2650gph pump with saltwater generator,lady bug automatic vaccum cleaner, Hydropools wide mouth skimmer, all hard plumbed 1.5" PVC

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    Re: Low Flow except when set to waste

    Thanks for the input. Unfortunately the flow issue occurs even when I bypass the filter. I will be taking some pictures or a video as soon as the rain stops!
    24k gal, IG, Fiberglass/Plaster, sand Hayward S210T, 1.5HP Vari, Hayward CL200 Inline, Installation Date Unknown (30 yrs+-)

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