Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 6 of 6

Thread: Is there any way to test the flow of your pump?

  1. Back To Top    #1
    DonW's Avatar
    Join Date
    Jun 2008
    Location
    Central IL.
    Posts
    95

    Is there any way to test the flow of your pump?

    Is there any way to test the flow of your pump? I have a 21" 200 lb. Sta-Rite sand filter with a 1 1/2 horse Waterford pump. I think that the suction of the pump stinks, and want to prove it. When vacuuming (manually) you have to go SUPER slow, so much so that it takes over an hour to vacuum. I'm using a 40 foot vacuum hose with a triangular vac head, and there is literally hardly any suction at all. Once the vac attachment is removed, if you put your hand in the skimmer basket with the pump on there is hardly a noticeable draw. The weir door is drawn in towards the skimmer and the pump is filtering. I'm not looking for a vortex in the skimmer, but I feel that the pull is inadequate. I have an inline chlorinator and an Aquluminator light in the return. My pump pressure is 10 pounds and steady. This is a completely new system but not my first pool. I guesss what I'm looking for is more pull through the vac head.
    18' x 33' AGP
    16,715 gal.
    200 lb. Sand Filter w/Hayward PowerFlo MATRIX 1.5 H.P. 2 Spd. pump
    Stenner Injection Pump System

  2. Back To Top    #2

    Join Date
    Dec 2007
    Location
    Central New York
    Posts
    504

    Re: Is there any way to test the flow of your pump?

    The way I would do it is with a bucket. Start your vacuum hose going without the vacuum head on it. Put a 5 gal bucket in the water below the water surface and put the end of the vacuum hose in it. Raise the bucket above the water line and watch how fast the vacuum hose drains the bucket.

    You could also take your return hose and see how fast it fills a 5 gal bucket with just the skimmer running. I am figuring that you have only one skimmer and no other device (2 skimmers or some type of bottom drain in your AG)in your pool.

    Also, how new is the system. I would think you could hook up a hose from the outlet of the pump and back to the pool, bypassing the filter, and see what kind of flow you get.

    If the filter in new, could be something wrong there except I would expect the pressure to be higher with that pump.
    Hotrod30

    20 X 40 foot vinyl Borates and Salt Pool
    Rolachem Chlorine Feeder
    Hayward 27 inch sand filter with 80 lbs of pea gravel
    Jacuzzi Splash Pak SP55 DE filter in parallel
    Pentair VF3050 pump

  3. Back To Top    #3

    Join Date
    Apr 2008
    Location
    Indonesia
    Posts
    311

    Re: Is there any way to test the flow of your pump?

    I assume that your plumbing system has a few "suctions" feeding the pump, one would be MAIN DRAIN, the other would be SKIMMER/OVERFLOW and last will be VACUUM all these 3 would have valves to isolate them or choose which one you want to use. This is what I have in my pool and I think this is a common set up.

    When I vacuum, I will close the valve for SKIMMER ( in my pool its called OVERFLOW because I have a balancing tank, not a skimmer ) and will set the valve for the main drain at 50%. This way the vacuum gets concentrated but not to the point of being dangerous, since there is still MAIN DRAIN to allow water flow for the pump in case I clogged the vacuum hose.

    40 foot vacuum hose is very long. Lots of power will be lost, most pumps are good at kicking water ( output ) but not at suction ( input ). Also to note if your hose comes in two piece where there is a connection since I think 33 feet is the standard single piece length, that connection is not very air tight if it floats on water surface. If you can sink that connection part, it will be good, your pump will not suck air. I use use lead weight to sink that connection, if it get submerged the vaccum power is good since it will suck water not air.

    If you want to know the flow of your pump as in water flow, you will need a FLowmeter, it tells you Gallon Per hour or Liter per hour flow, installed on the pipe. If you want to know the power of the suction, you will need a Vacuum gauge that reads in Hg. I have a vacuum gauge and a pressure gauge installed on my Hayward 2HP impeller housing.

    Long suction hose is a work burden for the pump, not just your vacuum hose, this will include all suction pipes that feed the pump. If you want concentrated suction power, you will need to shut all valves feeding the pump and only select VACUUM. However, this may cause lots of bubble formation visible in your pump strainer basket ( impeller housing ). These bubbles may not be air leak it may be simply too much suction resistance and the pump cavitates, hence you see those bubbles.
    Too much cavitation will damage your impeller very fast.

    You can simulate cavitation by closing all suction valves of the pump slowly up to the point the flow is so restricted, the air bubbles will formed within the water. Water is H2O remember.

    I test my vacuum suction power using the palm of my hand, its painful...yep... but it tells me how much suction I have.
    35,000 GL pool. In Ground. Concrete with all white ceramic tiles. Outdoor but shaded.
    Approx 36 ft by 15 feet. 2HP Hayward Super Pump, Hayward Sand Filter with Zelbrite ( Zeolite ), Hayward Cartridge Filter, Aquamatic Silver+Copper Ionizer ( suspended use since Oct 2008 ), Prozone Ozonator, 2 gram/hr, Analog Flowmeter on pipe

    Back Up Pump & Filter on trolley, Pentair 1.5HP + Pentair Cartridge Filter, Slime Bag 1 micron Jumbo Size, downstream of Cartridge

  4. Back To Top    #4

    Join Date
    Dec 2007
    Location
    Central New York
    Posts
    504

    Re: Is there any way to test the flow of your pump?

    Quote Originally Posted by SPP
    I assume that your plumbing system has a few "suctions" feeding the pump, one would be MAIN DRAIN, the other would be SKIMMER/OVERFLOW and last will be VACUUM all these 3 would have valves to isolate them or choose which one you want to use. This is what I have in my pool and I think this is a common set up.

    When I vacuum, I will close the valve for SKIMMER ( in my pool its called OVERFLOW because I have a balancing tank, not a skimmer ) and will set the valve for the main drain at 50%. This way the vacuum gets concentrated but not to the point of being dangerous, since there is still MAIN DRAIN to allow water flow for the pump in case I clogged the vacuum hose.

    40 foot vacuum hose is very long. Lots of power will be lost, most pumps are good at kicking water ( output ) but not at suction ( input ). Also to note if your hose comes in two piece where there is a connection since I think 33 feet is the standard single piece length, that connection is not very air tight if it floats on water surface. If you can sink that connection part, it will be good, your pump will not suck air. I use use lead weight to sink that connection, if it get submerged the vaccum power is good since it will suck water not air.

    If you want to know the flow of your pump as in water flow, you will need a FLowmeter, it tells you Gallon Per hour or Liter per hour flow, installed on the pipe. If you want to know the power of the suction, you will need a Vacuum gauge that reads in Hg. I have a vacuum gauge and a pressure gauge installed on my Hayward 2HP impeller housing.

    Long suction hose is a work burden for the pump, not just your vacuum hose, this will include all suction pipes that feed the pump. If you want concentrated suction power, you will need to shut all valves feeding the pump and only select VACUUM. However, this may cause lots of bubble formation visible in your pump strainer basket ( impeller housing ). These bubbles may not be air leak it may be simply too much suction resistance and the pump cavitates, hence you see those bubbles.
    Too much cavitation will damage your impeller very fast.

    You can simulate cavitation by closing all suction valves of the pump slowly up to the point the flow is so restricted, the air bubbles will formed within the water. Water is H2O remember.

    I test my vacuum suction power using the palm of my hand, its painful...yep... but it tells me how much suction I have.
    I assumed it was an above ground pool cause it's in the above ground pool category.
    Hotrod30

    20 X 40 foot vinyl Borates and Salt Pool
    Rolachem Chlorine Feeder
    Hayward 27 inch sand filter with 80 lbs of pea gravel
    Jacuzzi Splash Pak SP55 DE filter in parallel
    Pentair VF3050 pump

  5. Back To Top    #5
    DonW's Avatar
    Join Date
    Jun 2008
    Location
    Central IL.
    Posts
    95

    Re: Is there any way to test the flow of your pump?

    It is and thanks for the reply. I will try the bucket test to see if I can gauge the flow. Enclosed is a picture of the equipment pad. You might not see it very well, but does everything look o.k? I wonder if I have too many hose couplings in-line which is reducing the flow. I have heard of smooth wall hoses that reduce friction loss, but have yet to see any. Mine are ribbed. Also, I'm not a big fan of the equipment panel Sharkline gives you. It seems to me that the return and skimmer plate are too close to one another.
    Attached Images Attached Images
    18' x 33' AGP
    16,715 gal.
    200 lb. Sand Filter w/Hayward PowerFlo MATRIX 1.5 H.P. 2 Spd. pump
    Stenner Injection Pump System

  6. Back To Top    #6

    Join Date
    Apr 2008
    Location
    Indonesia
    Posts
    311

    Re: Is there any way to test the flow of your pump?

    so sorry...I did not realize this is an above ground section...ooppss.
    The new post facility sure do fast short cut....
    35,000 GL pool. In Ground. Concrete with all white ceramic tiles. Outdoor but shaded.
    Approx 36 ft by 15 feet. 2HP Hayward Super Pump, Hayward Sand Filter with Zelbrite ( Zeolite ), Hayward Cartridge Filter, Aquamatic Silver+Copper Ionizer ( suspended use since Oct 2008 ), Prozone Ozonator, 2 gram/hr, Analog Flowmeter on pipe

    Back Up Pump & Filter on trolley, Pentair 1.5HP + Pentair Cartridge Filter, Slime Bag 1 micron Jumbo Size, downstream of Cartridge

Posting Permissions

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