Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 2 of 2

Thread: Why does CYA take up to a week to show on tests?

  1. Back To Top    #1

    Join Date
    May 2014

    Why does CYA take up to a week to show on tests?

    I added some CYA and would like to test the water, but Pool School says to wait a week before testing. I'm curious as to why it takes a week for CYA to show up on test results.
    32'x16', 14K gal, AG vinyl, sand

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

    Re: Why does CYA take up to a week to show on tests?

    CYA dissolves very very slowly. It doesn't usually take a week, but it can sometimes take that long. It is safer to not risk it, wait the week, and be sure you are getting the full reading, rather than risk a false low reading, then adding more, only to end up with too much and need to replace water to get the level down.

    Another confounding factor, CYA can break apart into tiny grains which will continue dissolving slowly even through they are gone from the sock (or whatever you are using). So just seeing that all the CYA is gone from the sock doesn't tell you that the CYA has actually dissolved.
    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

Posting Permissions

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