Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 5 of 5

Thread: What is installed prior to SWG?

  1. Back To Top    #1

    What is installed prior to SWG?

    I'm sorry if this is common knowledge, but what is this inline device that is installed just prior to a SWG?

    The pic is terrible, I was hoping to get the model number to figure it out myself. Is it something for backpressure?

    20140509_201844.jpg

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

    Re: What is installed prior to SWG?

    That is probably a check valve, which are only occasionally installed before SWGs. It might instead be a flow switch, but they don't generally look quite like that. Those are the only two things that would have a flow arrow.
    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

    Re: What is installed prior to SWG?

    Thanks! I think there is a flow switch ahead of this item, but before the swg. So why would a check valve would be installed here? The equipment is about even with the pool deck.

  4. Back To Top    #4
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: What is installed prior to SWG?

    Check valves are sometimes used in this location to prevent water high in chlorine from flowing back towards the heater. Check valves are much more commonly used with tablet feeders, which perform a similar function as a SWG but involve much higher chlorine concentrations. They aren't usually needed with a SWG, though if the SWG is too close to the heater a check valve might be a good idea.
    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

  5. Back To Top    #5

    Re: What is installed prior to SWG?

    That probably explains it then. There is a heat pump nearby. Thanks for the info.

    20 x 40 28k gallon Salt Water Vinyl IGP, Hayward pump and Sand filter

Posting Permissions

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