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

Thread: New tub, first numbers

  1. Back To Top    #1
    Laenini's Avatar
    Join Date
    Aug 2008
    Brooklyn Center, MN

    New tub, first numbers

    The new tub arrived and its up and running. I just checked my first set of numbers and here they are:

    pH = 7.8
    FC = 1.5
    CC = 0.5
    TC = 2.0
    TA = 260
    CH = 320
    CYA = 25

    Now, before any of you tell me that I am crazy and that I need to go check those numbers again, I should explain that we used 1/2 fresh tap water and 1/2 water from my pool to fill the tub, so that is why there is already CYA and chlorine showing up.

    I did a quick check of my pool water and its readings tonight are:
    FC = 6.0
    CC = 0

    So, my first goal is to adjust the TA, correct? Its a 500 gal tub so I am going to add a total of 5 oz of MA (diluted and as 2.5 oz additions) and then turn all the jets on. Then I recheck in 30 min, right?

    Any thoughts too on why my pool tests negative for CC but I'm finding them right away in the tub? Should I shock just to be safe?
    Pool: 24' round by 48" deep AGP
    Waterway 1HP-2 speed pump, H100 Heater, sand filter, skimmer, using BBB (love it!)
    Hot tub: 2008 CalSpas, 8x8, 8 seats, 60+ jets, ozonator
    3 step bromine sanitation

  2. Back To Top    #2

    Join Date
    Jan 2009
    Cupertino, CA

    Re: New tub, first numbers

    You're on the right track for lowering TA. Because of the high CH and the high temp in the spa, you'll want to keep pH and TA low-ish in the long run.

    I always get some CC in the spa and rarely in the pool. I wouldn't worry about it as long as it's 0.5 or less.
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
    AG spa 325 gal, probably Sundance of some kind
    Water testing instructions on one page

  3. Back To Top    #3

    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: New tub, first numbers

    And I would especially not worry about the CC if you see it high after a soak -- that is to be expected. It's the CC level before the next soak that is relevant and as Paul says if it's <= 0.5 ppm I wouldn't worry about it.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

Posting Permissions

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