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Thread: LQ mod to increase flow rate

  1. Back To Top    #1

    Join Date
    Sep 2007
    Location
    Midwest
    Posts
    330

    LQ mod to increase flow rate

    First off...Thanks Rabbit...this is a modification of his idea.

    I have a LQ that gets a flow rate of "2.5 to 3" tops. I run my pump 24/7 & use 12% bleach and based on my swimmer load and sunlight was unable to maintain an adequate FC.

    Here is my modification.

    After filter...stock saddle...3/8" ID flow valve (connects on the outside of the tube)....stock tube to LQ....out of LQ by stock tube....3/8" ID x 1/2" ID barb converter....1/2" ID tubing!!!!....another 1/2" ID barb x 3/8" ID converter...stock tube...flowmeter....stock tube....3/8" ID flow valve...stock saddle....Pump

    This has increased my flow rate adequate to maintain my FC. It was not a dramatic increase but enough. Also..having a flow control valve @ the install locations I am able to run my pool pump and turn off the LQ to fill, clean and winterize.

    Here are some pics.

    After filter into LQ


    Out of LQ


    Through flowmeter


    Back to the pool
    Dave
    -------
    Our pool-
    20x40 Free Form Gunite (3'-8'), 26,000 G, AutoPilot Salt Chlorine Generator SC-48, Aqua blue pebble sheen, Textured Sundek, Pentair Easy touch with remote control, 1hp Sta-Rite Max-E-Pro pump, Max-E- Therm heater 333k BTU, System 3 Mod Media Cartridge filter, and Polaris 380 cleaner with booster pump

  2. Back To Top    #2
    Water_man's Avatar
    Join Date
    Jun 2008
    Location
    Brookline, MA
    Posts
    390

    Re: LQ mod to increase flow rate

    You still have a few inches of stock tube of 1/4" ID on the outflow line.
    Rabbit's advised to eliminate any 1/4" line.
    I wonder if you could gain more flow by doing that.
    This is my ticket for Heaven (when all's working..) :
    22k Gal gunite IGP, 38 SF Anthony DE filter, 1 HP Hayward Super Pump
    380k BTU Raypak Natural Gas Heater (Model RP405A) and solar cover
    8 gal Liquidator w/ 12% bleach, Dolphin Diagnostic Advantage robotic cleaner. 3800 ppm salt, 50 ppm borates.

  3. Back To Top    #3

    Re: LQ mod to increase flow rate

    Nice work, the big thing is to keep the 1/4 inch section 100% as short as possible. The 1/4 inch line will drop pressure pretty fast. In very small sections it's not dramatic.

    I'll have my new plastic parts on Monday as well as a 3/8 ID ball valve exactly like the one supplied with EQ only bigger.

    I'm maintaining a FC level now using a flow rate of ~3.75 w/10% and about 8 hours a day. Pretty light swimmer load. But AZ sun.

    Looks good.
    ~25k G 20x40 Free form plaster
    Pentair FNS Plus 48 sq/ft DE
    Pentair Challenger 1 HP High Flow E.E.
    Zodiac G4
    8 gal Liquidator 3/8 line conversion
    Sundance Palermo Spa w/ozone and gazebo

    LQ 3/8 Line Conversion

  4. Back To Top    #4

    Re: LQ mod to increase flow rate

    Just some numbers (roughly)

    @ 1.5 GPM 1 ft of 1/4 inch line will drop around 1.27 PSI of pressure
    @ 2.0 GPM 1 ft of 1/4 inch line will drop around 2.21 PSI of pressure

    @ 1.5 GPM 2 ft of 1/4 inch line will drop around 2.54 PSI of pressure
    @ 2.0 GPM 2 ft of 1/4 inch line will drop around 4.41 PSI of pressure

    @ 1.5 GPM 3 ft of 1/4 inch line will drop around 3.81 PSI of pressure
    @ 2.0 GPM 3 ft of 1/4 inch line will drop around 6.66 PSI of pressure

    Do you see how it sharply jumps up.

    Now lets look at some larger stuff

    @ 2.0 GPM 3 ft of 1/2 inch line will drop around 0.188 PSI of pressure
    @ 2.0 GPM 3 ft of 3/8 inch line will drop around 0.814 PSI of pressure

    @ 1.5 GPM 10 ft of 1/4 inch line will drop around 12.71 PSI of pressure
    @ 1.5 GPM 10 ft of 3/8 inch line will drop around 1.57 PSI of pressure
    @ 1.5 GPM 10 ft of 1/2 inch line will drop around 0.368 PSI of pressure

    I think everyone can see the point here. If you don't have at least the pressure coming to and from your pump to cover the head loss (drop) at the gallons per minute you are trying to achieve you end up settling for a limited rate based on the hose size and length.
    ~25k G 20x40 Free form plaster
    Pentair FNS Plus 48 sq/ft DE
    Pentair Challenger 1 HP High Flow E.E.
    Zodiac G4
    8 gal Liquidator 3/8 line conversion
    Sundance Palermo Spa w/ozone and gazebo

    LQ 3/8 Line Conversion

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