Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 7 of 7

Thread: Test results-please recommend

  1. Back To Top    #1

    Test results-please recommend

    Here are my numbers after replacing about 30% of the water. I have a gunnite bottom and fiberglass walls that have been coated with epoxy paint. Approx. 24000 gallons, sand filter.

    Free chlorine: 4
    Combined chlorine: <.5
    PH: 7.4
    alkalinity: 100
    CYA: 35 (was 80)
    hardness: 90
    temp: 75

    I believe I need to bring up my alkality and hardness. If so, what should my goal be and is there a non-pool store product that I can do this with?
    Please make any recommendations you see fit.

    Thank you so much,
    Mike
    gunnite bottom and fiberglass walls that have been coated with epoxy paint. Approx. 24000 gallons, sand filter.

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887
    Those numbers look good to me!

    Your alkalinity (TA) is fine where it is. And there is no reason to bring the CH level up (unless you have a spa you forgot to mention).

    Remember to keep FC around 3 to 7 and never below 3.
    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
    Quote Originally Posted by JasonLion
    And there is no reason to bring the CH level up (unless you have a spa you forgot to mention).
    Gunnite bottom needs Calcium??

    8000 gallon 20' x 48" round vinyl frame pool, 12" sand filter (don't have the specs on the pump), TF100 test kit
    Handy Links: PoolMath, TF-100 Test Kit, Pool School, CYA-Chlorine Chart
    "Shock" is a process, not a product!

  4. Back To Top    #4
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887
    Quote Originally Posted by The Mermaid Queen
    Gunnite bottom needs Calcium??
    The epoxy paint should have sealed the gunite, so there isn't any exposed plaster or concrete, so no need to add calcium.
    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

  5. Back To Top    #5
    Sorry, maybe I misread... thought only the walls had been coated... Just trying to earn my keep 'round here!

    8000 gallon 20' x 48" round vinyl frame pool, 12" sand filter (don't have the specs on the pump), TF100 test kit
    Handy Links: PoolMath, TF-100 Test Kit, Pool School, CYA-Chlorine Chart
    "Shock" is a process, not a product!

  6. Back To Top    #6
    Guest
    I get the same impression as TMQ, that the bottom is gunite and the walls painted fiberglass.

  7. Back To Top    #7
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887
    mjt123, if the gunite is not painted you need calcium. With exposed gunite calcium hardness should be between 200 and 300.
    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
  •