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

Thread: Calcium

  1. Back To Top    #1


    TC 14 (FC 14 CC 0)
    pH 7.5
    Calcium 11
    CYA 85

    Here's my question: When I did my calcium test it came up pink. Then it took 11 drops to turn it back to Light purple.
    Is this test valid? How do I determine if I need calcium?
    Chris M. 20k, inground, defilter, pebbletek, 1hp motor,Tiger Shark QC (crappy pool cleaner), TF-100

  2. Back To Top    #2
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: Calcium

    Did the color stop changing at purple with more drops added? You need to continue to add drops until the last one does not cause a color change (and it does not count).

    How much water did you use in the CH test? 25ml or 10ml? That determines the multiplier for the drops.
    10ml water sample makes each drop 25ppm ... so your CH would be 275ppm (likely higher as I am not sure you finished)
    25ml water sample makes each drop 10ppm ... so your CH would be 110ppm (likely higher as I am not sure you finished)
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  3. Back To Top    #3
    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: Calcium

    The CH test will go to sky blue when it's done. Lavendar is close, but not there yet. Question: how big was the sample? 10 ml or 25 ml?

    I'd say you need to rerun the test.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

Posting Permissions

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