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Thread: FlowVis® Flow Meter - Your Pool GPM

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    Join Date
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    FlowVis® Flow Meter - Your Pool GPM

    I recently installed the FlowVis® Flow Meter. I was wondering what other members are seeing with their GPM readings on their pools.

    My info:

    - In-Ground 15k Gal kidney-shaped pool
    - 2" Piping
    - Pentair "Challenger" single-speed Pump; no specs available
    - Pump/Filter are close to pool
    - D.E. Filter - 36 Sq Ft . Typical PSI: 15-16 . Last Backwash was done on Nov 11/23/15 . My usual Backwash cycle (time between Backwashes) is between 3-6 months.

    My FlowVis® Meter initial reading was about 52-53 GPM. It seems to have settled out at 50 GPM after 4 days with the meter installed.
    - Pool Type: 15k Gal Gunite IG non-SWG / Built 1988
    - Pump: Pentair Challenger / Sweep Pump: Letro Model LA01N .75HP Single-speed / 6 hrs-day (1 turnover)
    - D.E. Filter: OEM: Nautilus (Pentair) #NS 36 / 36 Sq Ft / D.E. Charge: 3.6 Lb
    - Pentair 4-wheel Sweep LL505G - Booster Pump runs ~2 hrs/day

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    Re: FlowVis® Flow Meter - Your Pool GPM

    I am not sure how other pools gpm will be helpful. 50 or sop gpm seems about right for your pool but a little hard to say with no pump specs available.

    My pool was around 82 gpm but a larger pool and pump.

    What are you hoping to determine?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: FlowVis® Flow Meter - Your Pool GPM

    Don't have a meter but that is a really nice looking tool especially if you had a variable speed pump so you can dial in your desired flow rate.

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    Re: FlowVis® Flow Meter - Your Pool GPM

    Quote Originally Posted by duraleigh View Post
    I am not sure how other pools gpm will be helpful. 50 or sop gpm seems about right for your pool but a little hard to say with no pump specs available.

    My pool was around 82 gpm but a larger pool and pump.

    What are you hoping to determine?
    Thanks for the info. I was curious about it since I've never measured my pool's GPM before installing this meter and was wondering how it compared with other member's pools.

    I can't obtain the Pump specs due to the age of the pump casing. The template is rusted and aged (not readable).
    - Pool Type: 15k Gal Gunite IG non-SWG / Built 1988
    - Pump: Pentair Challenger / Sweep Pump: Letro Model LA01N .75HP Single-speed / 6 hrs-day (1 turnover)
    - D.E. Filter: OEM: Nautilus (Pentair) #NS 36 / 36 Sq Ft / D.E. Charge: 3.6 Lb
    - Pentair 4-wheel Sweep LL505G - Booster Pump runs ~2 hrs/day

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    Re: FlowVis® Flow Meter - Your Pool GPM

    I would say that flow sounds reasonable. I bet it is a little lower than your pump curve (long gone) but my actual flow is lower than the pump curve, too.

    If it is easy for you to divert all the flow out of the pump into a 5 -gallon bucket, you can test the accuracy of the Flow-vis.

    I would throttle down the suction side until I got the Flow-vis reading about thirty gpm. Then your 5 gallon bucket should fill in 10 seconds.

    Might be too much work if your setup is glued without unions but I thought I would mention it.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: FlowVis® Flow Meter - Your Pool GPM

    I have this.... has been reading consistently at 70 gpm on full speed
    2015 build (link)| 16.5 K gal | Salt Water | IG rect | 35'x16' | 568 sf | 105 ft peri | depth 3'-5' | PV3 in-floor | 2 Venturi skimmers | MDX+SDX drains | T-CELL-15 SWG | Hayward Ecostar VS pump | Hayward 7220 DE Filter | Aqua Cal Icebreaker Heat / Cool pump SQ166 | Hayward Sense & Dispense PH Controller| Omnilogic | Pebble Sheen Blue Surf | Ultra UV | Stenner acid pump | Coverstar Automatic | TF-100

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    needsajet's Avatar
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    Re: FlowVis® Flow Meter - Your Pool GPM

    My FlowViz reads 50 gpm on high and 32 gpm on my low setting. FWIW, I saw some tests on another forum suggesting accuracy around +/- 5%.
    12k IG salt; glass beads in plaster; K-2006C, K-1766, CCL, and Aussie 4in1 (HTH); Pentair Eco800 1.2HP VS; Zodiac SWC 1.3 lb/day (25 g/hr); 25" filter recycled glass; OKU solar panels; 1/2 HP solar pump; Rebel (Warrior) pool cleaner; FlowViz; prior pool AG 10k | Read Before Posting to get the best possible advice | ... and this helped me a lot!: TFPC for Beginners

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