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Thread: retrofit - adding SWG to pool/spa/solar

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    Join Date
    Apr 2007
    Location
    Northern CA
    Posts
    18

    retrofit - adding SWG to pool/spa/solar

    Friend of mine has a 25-30 year old pool, he wants to add an SWG, re-plumb the solar side to replace out the old solar and check valves (which don't seem to be checking!), along with adding solar shut-offs and a bypass valve to control the water pressure to the solar panels (it sometimes blows the rubber couplings!)

    A couple questions -

    Should we plumb/power the SWG to run while the spa is on? - (I think we should). His concerns are to much chlorine will be generated while using the spa. My contention is that is exactly when you need it the most!

    Should we plumb the solar computer to only be powered when the pump has power? - (I think we should). Currently it's powered all the time and his concerns are the electrical shock to the solar computer's circuit board when the pump and solar computer starts up simultaneously and that could somehow harm the circuit board inside. I explained that the solar computer will be actuating the solar valve needlessly (ie: pump not on and no water going to the solar), this wastes several rotations of the actuator/valve daily, (my system powers the solar on/off with the pump and has been working for 3 years this way without issues).
    34'X 15' 3'-8' depth 22,000 gallon in-ground Grecian style built July of 2004, Blue Tahoe PebbleSheen, Poolpilot DIG-220 w/SC-60 SWCG, Pentair WFE-4 1HP filter pump, 6' S/S Waterfall and WFEDS-6 2 spd Waterfall pump, Letro Legend Platinum cleaner w/LA01N pump, Sta-Rite DE filter S8D110 53 sq. ft., 648 sq ft. East facing Solar panels w/Pentair LX 220 solar control, 6' Pewter Gray SR Smith Glas-Hide dive board on black powder coated cantilever stand w/SS hardware

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: retrofit - adding SWG to pool/spa/solar

    You don't want the SWG to be on when the system is in spa only mode, unless you have a controller that automatically lowers the percentage setting in spa mode. A SWG is normally configured to make enough chlorine for the entire pool. If it is producing chlorine at that rate when you are in spa only mode it will be way too much chlorine for the much smaller volume of water in the spa.

    The two most common ways to setup a solar system are to either power down the solar system when the pump is off, or to have it automatically turn the pump on when there is heat available from the solar panels. Setting it up so the solar is on and the pump stays off isn't a great idea, although it won't cause any significant damage, just a little extra wear.
    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

    Join Date
    Apr 2007
    Location
    Northern CA
    Posts
    18

    Re: retrofit - adding SWG to pool/spa/solar

    Great thanks Jason.
    34'X 15' 3'-8' depth 22,000 gallon in-ground Grecian style built July of 2004, Blue Tahoe PebbleSheen, Poolpilot DIG-220 w/SC-60 SWCG, Pentair WFE-4 1HP filter pump, 6' S/S Waterfall and WFEDS-6 2 spd Waterfall pump, Letro Legend Platinum cleaner w/LA01N pump, Sta-Rite DE filter S8D110 53 sq. ft., 648 sq ft. East facing Solar panels w/Pentair LX 220 solar control, 6' Pewter Gray SR Smith Glas-Hide dive board on black powder coated cantilever stand w/SS hardware

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