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Thread: Question on adding CYA with a sock

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    Join Date
    Jul 2008
    Sinking Spring, PA

    Question on adding CYA with a sock

    What is the purpose of using a sock to add CYA and how do you attach the sock so it doesn't float away?

    Why is a sock better than adding it directly to the skimmer?

    Just trying to increase my knowledge!

    4th Year Pool owner in Sinking Spring PA
    46'x23' Free Form Concrete (34,000 gallons), Aqua Blue Pebble Sheen Finish, Pentair IntelliChlor SWG
    Pentair Intelliflo Variable Speed Pump, Pentair D.E. FNS Filter, Pentair MasterTemp heater.

  2. Back To Top    #2
    poolgirl22's Avatar
    Join Date
    Apr 2010
    Stephens City, VA

    Re: Question on adding CYA with a sock

    The purpose of putting it in the sock is so that it is in the water as soon as it dissolves. The sock is better than adding to the skimmer because when you add to the skimmer it gets sucked into the filter where you have to wait for it to dissolve. You can't backwash a filter for up to a week (?) If it's in the sock you can backwash as needed. More important in cases of swamps where you may not be able to wait to backwash for several days.

    I would suggest a tall tube type sock weighted to the pool edge with a rock or tied off somehow. I've never done it this way but will next year. It needs to be in front of a return so the flow of water helps speed the process. Some folks massage the sock to speed things even further.
    Backyard pool-less, but used to be.....
    16,100 gallon, 18x38 3.5 ft deep oval AG, Vinyl, Sand, 1hp pump Liquidator TFT100 test kit

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Question on adding CYA with a sock

    Depending on your situation, adding CYA to the skimmer can be simpler and work just fine as long as you don't backwash for a week. However, many people seem to end up backwashing sooner than they expected and losing some or most of the CYA added through the skimmer. Hanging a sock in front of a return avoids that risk/worry.
    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

  4. Back To Top    #4
    MikeInTN's Avatar
    Join Date
    May 2007
    Middle Tennessee

    Re: Question on adding CYA with a sock

    Another method is to put the sock/stocking in the skimmer, being careful not to block off the water flow. I use this method and use a cheap knee-high stocking instead of a sock. The CYA forms a nice little ball at the bottom of the stocking; I tie a knot in the stocking just above the CYA, and use the top part of the stocking to tie it off to the outside of my skimmer.
    24' x 52" AGP - approx 13,500 gallons
    Pentair Optiflo 1 hp/2sp pump w/ Swimpro Voyager 150 sq ft cartridge filter
    Intex 8110 SWCG
    "Fear the Schnauz!"

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