Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 8 of 8

Thread: TF-100 calcium test question

  1. Back To Top    #1

    TF-100 calcium test question

    I've only had the kit for a week or two and I feel pretty comfortable with all the tests except the calcium test. When I add drops (attempting to make solution turn blue) I notice the liquid part turns blue, but I have pink flakes. Do I continue adding drops until everything is undoubtedly blue?

    #'s (I'm shocking)
    11 FC
    .5 CC
    PH 7.5
    TA 130
    Cal 480-540??
    CYA 15

    I'd really like to get the calcium number down, I did a 40% refill on the pool and it didn't seemed to help much. I tested some water out of the tap and it was 220 (no flakes). The person before me used cal-hypo like it was going out of style, so I assume that is where most of it came from. Is this something to be concerned about, if so, how do I manage it?
    15,000 gallons
    Sand
    IG
    Vinyl

  2. Back To Top    #2

    Join Date
    Feb 2008
    Location
    Denton, TX
    Posts
    5,061

    Re: TF-100 calcium test question

    Calcium is not an issue for a vinyl lined pool.

    If the liquid in the sample is blue, then you have reached the endpoint of the test. It is normal to see little globules in there that are pink or violet. All you are looking for is for the sample to be blue.

  3. Back To Top    #3

    Re: TF-100 calcium test question

    Thanks! So it's more of an issue for the pool surface than the equipment, I see. I was a little concerned about the pump/heater. I appreciate the help!
    15,000 gallons
    Sand
    IG
    Vinyl

  4. Back To Top    #4

    Re: TF-100 calcium test question

    Normally your vinyl pool could care less about calcium. In your case the calcium is high enough to cause scaling if your Ph and Ta get out of hand. I would change out 40 percent more water, its the easiest and safest option. Your cya is low so at least you won't lose too much.
    Cal-hypo is something no vinyl pool owner should buy.
    coloeb,
    20k gal. IG fiberglass/plaster rectangle 32'x16'
    Hayward Superpump 3/4 H.P. primary Hayward model 5060 Booster Pump
    Hayward Pro Series High Rate Sand Filter
    Pentair Model 320 automatic Chlorine/bromine in-line feeder

  5. Back To Top    #5
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: TF-100 calcium test question

    Vinyl liner pools are fine with low CH levels, but all pools are at risk for high CH levels. You need to either bring down your CH level, or bring down your TA to compensate for the high CH level, fairly soon.
    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

  6. Back To Top    #6

    Re: TF-100 calcium test question

    Thanks for all the input, I'll work on bringing it down. Looks like I'll be doing a couple of refills...
    15,000 gallons
    Sand
    IG
    Vinyl

  7. Back To Top    #7

    Re: TF-100 calcium test question

    How much water does it take to keep the vinyl liner down, what is the minimum safe amount of water? 6"?

    If I do a 50% refill twice, I'll get 75% of it replaced (diminishing returns)... I need to replace 85% according to the pool calculator. So if I replace 60% twice then I'll get 84% replaced... I'd really like to minimize the refill without endangering the liner. I'm probably over thinking this... Thanks for the help so far!!!
    15,000 gallons
    Sand
    IG
    Vinyl

  8. Back To Top    #8
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: TF-100 calcium test question

    To be on the safe side, I would leave one foot of water in the shallow end of the pool. Of course, if there is any chance you have a high water table you shouldn't drain even that low.
    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
  •