Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 4 of 4

Thread: Why did pH drop over winter?

  1. Back To Top    #1
    Saturn94's Avatar
    Join Date
    Mar 2015
    Location
    Virginia
    Posts
    461

    Why did pH drop over winter?

    I was discussing with friends my spring opening in progress and the question came up about why my pool's pH drops during the winter.

    Normally when I close in early October the pH is at 7.5. When I open in early May the pH is usually 7.0 - 7.2.

    Despite being covered with a solid cover (actually solid tarp style cover over a mesh safety cover), there is a bit of dirt, debris, and lots of dead worms/bugs (yuck!)/etc in the pool when I open.

    My theory is the decomposition process of organic matter in the pool is lowering the pH. Am I on the right track, or is something else going on?

    I don't see this as a problem, just curious and want to learn.
    20k IG vinyl liner/Aqua Rite SWCG, T-15 cell/Hayward Pro Grid 6020 DE filter/Polaris 280 with booster pump/Hayward Superpump 1 hp/city water/pool installed March 2004

  2. Back To Top    #2
    Saturn94's Avatar
    Join Date
    Mar 2015
    Location
    Virginia
    Posts
    461

    Re: Why did pH drop over winter?

    Another thought....

    It's not unusual for me to lose some CYA over the winter. Could the biodegrading of CYA result in the pH drop?
    20k IG vinyl liner/Aqua Rite SWCG, T-15 cell/Hayward Pro Grid 6020 DE filter/Polaris 280 with booster pump/Hayward Superpump 1 hp/city water/pool installed March 2004

  3. Back To Top    #3
    Texas Splash's Avatar
    Join Date
    Jun 2014
    Location
    South-Central Texas, Marion/San Antonio
    Posts
    12,978

    Re: Why did pH drop over winter?

    CYA can certainly drop some over the winter months and not unusual. pH changes depend on the type of pool and a variety of factors. While pH might tend to rise in colder weather, we know a newly plastered pool will accentuate that rise. Pools that receive rain water might see a drop in pH and TA. Covered pools are also effected by the entrapment of moisture and outgassing as well. If TA experiences a drop over time, it could then allow the pH to drop with it as well. Really not sure if the biodegrading of organic material would be responsible for significant changes in pH. Perhaps one of the others here might have more info in their mental (pool) tackle box.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

  4. Back To Top    #4
    Saturn94's Avatar
    Join Date
    Mar 2015
    Location
    Virginia
    Posts
    461

    Re: Why did pH drop over winter?

    Still hoping for more on this....
    20k IG vinyl liner/Aqua Rite SWCG, T-15 cell/Hayward Pro Grid 6020 DE filter/Polaris 280 with booster pump/Hayward Superpump 1 hp/city water/pool installed March 2004

Posting Permissions

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