Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 3 of 3

Thread: Testing after adding CYA

  1. Back To Top    #1

    Join Date
    Jan 2010
    Location
    Southeast Missouri
    Posts
    33

    Testing after adding CYA

    Yesterday I added enough CYA to raise my level from 30 to 40. It was a granular form that I purchased at Lowes. I tried to dissolve it in a bucket of water but soon learned it would not dissolve. Then I remembered reading something on here about putting it in a sock in front of the skimmer so I did that. I added 22 oz by volume and after it had been in the water for a few hours I checked on it to see how much had dissolved. By squeezing the sock, I could see the white liquid flowing into the skimmer. It didn't take long to get all 22 oz disolved.

    My question is, since it went through the sand filter first is that why I should wait about a week before retesting the CYA level? Does it take that long to work it's way through the sand in the filter and get into the pool? Would it be better to hang the sock in front of my return as I have now seen suggested on here?

    Last night we got a lot of rain and more coming this week. I will need to drain a few inches water from the pool in a day or two most likely but don't want to lose any of the CYA by pumping to waste. Would it be better to use a hose and syphon the water out of the pool instead of using the pump? My filter pressure is still low so I won't need to backwash for a while.
    Dave in Sikeston, Mo.
    27' AG, 16K, vinyl, 1.5 HP pump, Pentair Meteor sand filter, Hayward Aqua Rite 25K SWG, Pentair E-Z Vac cleaner, TF100 test kit

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887

    Re: Testing after adding CYA

    CYA tends to break down into smaller and smaller grains, getting out of the sock and into the filter long before it is totally dissolved. It isn't fully dissolved for several days to a week, regardless of how it is added to the pool.

    It doesn't really matter which way you add the CYA as long as you don't have some other reason to backwash the filter. If you expect to need to backwash the filter, then using the sock in front of a return approach is good.
    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
    Jan 2010
    Location
    Southeast Missouri
    Posts
    33

    Re: Testing after adding CYA

    Thanks Jason, that makes sense. I will wait until the end of the week to retest.

    I am still feeling my way around but getting more comfortable with the BBB method every day. My co-workers talk about opening their pools and some of the stories make you cringe! I have mentioned TFP to them but some are happier spending more money and not ever knowing what is in their water I guess.
    Dave in Sikeston, Mo.
    27' AG, 16K, vinyl, 1.5 HP pump, Pentair Meteor sand filter, Hayward Aqua Rite 25K SWG, Pentair E-Z Vac cleaner, TF100 test kit

Posting Permissions

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