Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 8 of 8

Thread: Reducing flow of waterfall.

  1. Back To Top    #1

    Reducing flow of waterfall.

    Hi guys I am new to pool ownership I have learned a lot from this forum and pool school but still have a few questions.

    I have a waterfall powered by its own pump and it really pushes a lot of water and makes a nice looking feature. But I would like to turn down the water flow sometimes to create quieter more relaxing mood. Right before the pump is a 2 way Jandy valve I have partially closed the valve and it reduces the water flow to the pump but I am slightly worried that reducing the water flow to the pump while its running might cause issues in the pump or the pipes.

    I am at work right now and don't have stats on exact pipe/pump size and valve type but if needed I can get the info and maybe some pics tonight.

    Thanks

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

    Re: Reducing flow of waterfall.

    That is a very reasonable way to reduce the flow rate. You can usually tell how the pump is doing by the noise it is making. As you turn the valve the noise should stay more or less the same for a while and then start to get louder quickly. As long as you stay away from the louder quickly area you should be fine.

    The will only way to damage the pump would be to turn the water flow off nearly completely. That would cause the wet end of the pump to overheat and possibly melt.
    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
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: Reducing flow of waterfall.

    Well, Jason beat me ... here are my comments

    Welcome

    Given your description, it sounds like the only control you have to to reduce the suction by closing the valve. I assume it is wishful thinking that there is not another 3-way valve on the return pipe to the waterfall with bypass route back to the pool?

    It would certainly not be good to completely close the suction valve and you will run into overheating issues. In my mind as long as you are getting some water to the pump, I think it should be ok.

    Certainly not the most efficient way to reduce the flow as would be possible with a variable speed pump.

    There are a few options like maybe connecting the waterfall to your main pump and not using the separate pump; getting a smaller waterfall pump; adding a bypass line (not likely very easy) ... but these kind of depend on your setup and desires.
    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
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  4. Back To Top    #4

    Reducing flow of waterfall.

    Beat me to it so what they said
    18' x 33' Aqua leader AGP (~19k gal) w/hayward swimpro voyager cartridge filter and 2hp hayward pump.
    8 Gal LQ, hayward heater.

  5. Back To Top    #5

    Re: Reducing flow of waterfall.

    Thanks for all the responses guys. I will turn on the waterfall tonight and listen as I reduce the flow. Maybe if/when the pump dies I will look into a variable speed pump.

  6. Back To Top    #6
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    11,484

    Re: Reducing flow of waterfall.

    The pump should actually get quieter has you restrict more flow because the flow rate is reduced through the pump. This also reduces the load and power consumption of the pump so there is really no danger to the pump motor unless you shut off the flow completely. However, the throttling valve may get louder because of the restriction as the water velocity increases through the smaller orifice of the valve.
    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

  7. Back To Top    #7

    Join Date
    Aug 2007
    Location
    Hunterdon County, NJ
    Posts
    28

    Re: Reducing flow of waterfall.

    Does it make a difference to any of the answers above if the two way valve is on the suction side or pressure side of the pump? I have a similar issue with my sheer decents, but only have a two way valve on the pressure side.

    Thanks!
    John
    31,000 gal gunite/Pebblesheen pool w/spillover spa, 2-speed 1.5 HP filter pump, 3 hp spa jet pump, 2 hp sheer decent pump, blower, DE filter, Jandy automation and SWG, Jandy 400K BTU gas heater, Polaris 280 cleaner with booster pump.

  8. Back To Top    #8
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    11,484

    Re: Reducing flow of waterfall.

    It can make a big difference. You should only restrict the return side a pump for the type of flow rate reduction that you are trying to accomplish. Excess restriction on the suction side can lead to cavitation so it should be avoided. However, you can redirect flow on the suction side for a cleaner or to create more suction for a skimmer but even that has its limits.
    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

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •