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Thread: Intelliflow VF and venturi feeders

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    Intelliflow VF and venturi feeders

    Hi everyone,

    I've inherited an older 27K gallon in-ground pool with a brine tank chlorine generator ("Pool Perfector").
    I bought an Intelliflo VF pump to replace the older pentair pump that its using now, with the goal of drastically reducing the electrical costs of running the pool.

    However, after I bought the pump (of course!), it dawned on me that the chlorine generator relies on a "venturi feeder" to pull the chlorine brine/gas from the brine tank to the water returning to the pool. In essence, it's a reducing fitting in the return line with a drip line from the tank.

    As I understand it, the point of pumps like the Intelliflo VF is to move water at a lower pressure and lower velocity, thus using less electricity.

    Anyone have any thoughts on whether the VF will work with the venturi feeder? And, since there is a pretty big reduction in flow there which I assume will increase water pressure behind it, will that negate the value of the pump?

    Thanks!
    San Jose, CA - 27,000g in ground plaster pool. One 3/4hp filter pump. Cartridge filter. "Pool Perfector" chlorine generator. Blue Diamond pool cleaner.

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    spishex's Avatar
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    Re: Intelliflow VF and venturi feeders

    It won't negate the value of the pump. Even running at the same GPM that your old pump was moving you'll still save money relatively. Does your venturi assembly look something like this:

    ...where the venturi itself is in a small, adjustable bypass? If so you may be able to make the necessary adjustment with the bypass valve to get the venturi's inlet pressure up where it needs to be. Performance varies by injector, and I'm not sure what kind of suction you need to pull the chlorine gas out (does the literature for the brine tank happen to say?), but I'd bet that if you're moving enough water to run two skimmers and a main drain that you'll have enough pressure for the venturi.

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    Re: Intelliflow VF and venturi feeders

    Thanks for the response. Yep, it's that same sort of setup with the bypass. I've attached a picture. I'm glad to hear you think it'll work. I don't have the docs for the Pool Perfector, so don't know what pressure it requires. I can tell when it's working, though, because I get fine bubbles at the returns in the pool.

    There is only one skimmer in the pool and, interestingly, as far as I can tell the pump is only pulling from the skimmer and not the main drain (no suction at the drain when the pump is running). After clearing some overgrown ivy around the cement platform that the pump is placed on, I found a capped stub of a pipe coming up out of the cement a few feet away. I suspect that there was a heater in place at one time, and the main drain was plumbed in to the system back then.

    My plan for spring is to replace the pump and also see if I can plumb the main drain back in so the pump can draw from both the skimmer and the drain.

    Thanks again!
    Attached Images Attached Images
    San Jose, CA - 27,000g in ground plaster pool. One 3/4hp filter pump. Cartridge filter. "Pool Perfector" chlorine generator. Blue Diamond pool cleaner.

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    Richard320's Avatar
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    Re: Intelliflow VF and venturi feeders

    Quote Originally Posted by malaxi
    There is only one skimmer in the pool and, interestingly, as far as I can tell the pump is only pulling from the skimmer and not the main drain (no suction at the drain when the pump is running).
    Are you sure?

    I, too, am suddenly a pool owner, since it came with the house. I couldn't figure out where my drain went, either, but I discovered it by asking here. Inside my skimmer, there are two pipes. One goes to to main drain. Pull the basket in your skimmer and have a look.
    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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    Re: Intelliflow VF and venturi feeders

    Quote Originally Posted by Richard320
    Quote Originally Posted by malaxi
    There is only one skimmer in the pool and, interestingly, as far as I can tell the pump is only pulling from the skimmer and not the main drain (no suction at the drain when the pump is running).
    Are you sure?

    I, too, am suddenly a pool owner, since it came with the house. I couldn't figure out where my drain went, either, but I discovered it by asking here. Inside my skimmer, there are two pipes. One goes to to main drain. Pull the basket in your skimmer and have a look.
    I did check in the skimmer, and the other outlet/inlet is plugged. It's got a removable plug, but I haven't been brave enough to remove it to see what happens.

    Well, I guess a little experimentation come spring is called for. I wonder how dangerous (for the plumbing) it would be to put an air fixture on the capped pipe by my pump and pressurize it? See if bubbles come out my main drain...
    San Jose, CA - 27,000g in ground plaster pool. One 3/4hp filter pump. Cartridge filter. "Pool Perfector" chlorine generator. Blue Diamond pool cleaner.

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    spishex's Avatar
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    Re: Intelliflow VF and venturi feeders

    That's how I'd test the line.

    You'll need about 40 GPM for a 12 hour turnover, so that's roughly enough to run 3 suction fittings if you had them. I think at that speed you'll be good to go.

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