Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 9 of 9

Thread: 2 things: CYA and PH

  1. Back To Top    #1

    Join Date
    Jul 2007
    Location
    North of Dallas
    Posts
    207

    2 things: CYA and PH

    Holding good chlorine numbers, around 4 to 5 ppm currently and I just backed the swg off a tad to get a more consistent 3 to 4 ppm. Currently, the pumps are running 20 hours a day. I was hoping to get the CYA up to help me with that some.

    Now, I added 12 pounds of CYA granules last tuesday to the skimmer. As of today, there's no real noticeable increase on the test strips. Before I added, it showed to be from 0 to the 20/30 mark (hard to tell exactly) and it's showing somewhere in the 30/40 range right now. Granted, the strips are vague but there's a definite color difference from 0 to 30 and from 30 to 100. According to the calc.; from 30, the 12 pounds should've taken me to 75 or 80 and that would be a noticeable color change. I did have to drain a few inches this past saturday but I just expected more. And of course, no backwashing was performed.

    On the matter of PH, I'm currently having to add a gallon every couple days to keep it somewhat in check. It was 7.8 on Friday and I added a gallon and left for the weekend. Got back Sunday afternoon and checked it, it was right there in the 7.8 range. Today, I added another gallon. Does this seem a little much or with the new plaster/constant spa waterfall/SWG or will this be life for awhile? I opened up the main drain to the spa to try and pull water back that way to keep it from falling over so much but it still built up and started pouring over, so I'll have to live with that aeration I guess.

    According to the strips, my alkalinity is in the 120 range.

    In regards to testing, Alan from askalanaquestion.com assured me that my ColorQ would be shipping very very shortly like any second now. It has to come from Lamotte directly. And, I've tried every pool store within 20 miles and they're either more AquaChek test strips or some OTO 2 part tests, which I have and will check the chlorine and PH with this afternoon.
    My Pool - 18x24 fully setup Cabana, 22x48 gunite/quartz plaster (3-5-3 depth) & 8' spa w/ spill and 5' natural rock waterfall; Hayward DE filter/pumps/heater; Hayward Pro Logic controller; Phantom cleaner. Finished 06/01/07.

    RedishConstruction.com

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887
    It is very difficult to get plausible measurements from test strips. The CYA tests seem to be particuarly trouble prone on the strips. Unfortunatly, the ColorQ seems to be a little problematic with the CYA test in particular as well. You might want to pick up one of the WalMart HTH 6 way test kits. It can only do two or three CYA tests but it is under $20. Or you could look for the Taylor K-1721 CYA test kit on the Internet, but it isn't as good a deal.

    If you lower your alkalinity to 70-80 your PH should be more stable, but with new plaster and a waterfall you will continue to need to keep an eye on the PH. Adding borates to 30-50 ppm would also help noticably with the PH drift. Even so new plaster will continue to raise the PH for several months to a year, just more slowly.
    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

    Join Date
    Jul 2007
    Location
    North of Dallas
    Posts
    207
    Quote Originally Posted by JasonLion
    It is very difficult to get plausible measurements from test strips. The CYA tests seem to be particularly trouble prone on the strips. Unfortunatly, the ColorQ seems to be a little problematic with the CYA test in particular as well. You might want to pick up one of the WalMart HTH 6 way test kits. It can only do two or three CYA tests but it is under $20. Or you could look for the Taylor K-1721 CYA test kit on the Internet, but it isn't as good a deal.

    If you lower your alkalinity to 70-80 your PH should be more stable, but with new plaster and a waterfall you will continue to need to keep an eye on the PH. Adding borates to 30-50 ppm would also help noticeably with the PH drift. Even so new plaster will continue to raise the PH for several months to a year, just more slowly.
    thanks Jason. I'm trying to just use the strips as a guideline and won't be adding any more CYA until I can get a good test done. I'll check out the Walmart deal. I'd like to order one of the TFP test kits but being impatient, thought I'd get something quickly. Well, as time goes on and I can't find one, I would've already had the TFP one with plenty of time left over.

    Anyways, thanks again for the response.
    My Pool - 18x24 fully setup Cabana, 22x48 gunite/quartz plaster (3-5-3 depth) & 8' spa w/ spill and 5' natural rock waterfall; Hayward DE filter/pumps/heater; Hayward Pro Logic controller; Phantom cleaner. Finished 06/01/07.

    RedishConstruction.com

  4. Back To Top    #4
    frustratedpoolmom's Avatar
    Join Date
    May 2007
    Location
    SWSuburban Chicago, IL
    Posts
    11,963
    Careful with the strips, my strips said 30-50 CYA but my HTH 6 way said 70.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

  5. Back To Top    #5

    Join Date
    Jul 2007
    Location
    North of Dallas
    Posts
    207
    just picked an hth up from walmart and will check it again this afternoon with that.
    My Pool - 18x24 fully setup Cabana, 22x48 gunite/quartz plaster (3-5-3 depth) & 8' spa w/ spill and 5' natural rock waterfall; Hayward DE filter/pumps/heater; Hayward Pro Logic controller; Phantom cleaner. Finished 06/01/07.

    RedishConstruction.com

  6. Back To Top    #6
    tagprod's Avatar
    Join Date
    Jul 2007
    Location
    Tomball, Texas
    Posts
    489
    Quote Originally Posted by JasonLion
    It is very difficult to get plausible measurements from test strips. The CYA tests seem to be particuarly trouble prone on the strips. Unfortunatly, the ColorQ seems to be a little problematic with the CYA test in particular as well. You might want to pick up one of the WalMart HTH 6 way test kits. It can only do two or three CYA tests but it is under $20. Or you could look for the Taylor K-1721 CYA test kit on the Internet, but it isn't as good a deal.

    If you lower your alkalinity to 70-80 your PH should be more stable, but with new plaster and a waterfall you will continue to need to keep an eye on the PH. Adding borates to 30-50 ppm would also help noticably with the PH drift. Even so new plaster will continue to raise the PH for several months to a year, just more slowly.
    How do you add borates? My PH does a lot of climbing too.
    Brian
    20K IG Gunite w/ raised 7ft spillover spa. 1.5 HP Hayward Northstar pump 425 sq ft Hayward cartridge filter, Colorlogic lights AquaRite SWG AquaLogic PS-8 control
    1hp pump for sheer descent

  7. Back To Top    #7

    Join Date
    Jul 2007
    Location
    North of Dallas
    Posts
    207
    i appreciate the borates approach but am not interested at this time due to my 5 year boy who drinks more of the water than I can put in as well as my 2 dogs.
    My Pool - 18x24 fully setup Cabana, 22x48 gunite/quartz plaster (3-5-3 depth) & 8' spa w/ spill and 5' natural rock waterfall; Hayward DE filter/pumps/heater; Hayward Pro Logic controller; Phantom cleaner. Finished 06/01/07.

    RedishConstruction.com

  8. Back To Top    #8
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887
    Quote Originally Posted by tagprod
    How do you add borates? My PH does a lot of climbing too.
    You add fairly large amounts of borax and enough acid to get the PH back to where it started. There is a calculation for the amount of borax and acid to use near the bottom of my pool calculator, see the link in my signature. The borates calculation in BleachCalc is wrong. Aim for 30-50 ppm of borax. There is some risk to pets if they drink large amounts of pool water. People, even kids, don't seem to be at any risk, but I would hesitate with infants.

    The borax will act as an additional PH buffer to slow the increase of PH. You will still need just as much acid as before, but you can add it all at once at quite long intervals, instead of adding it constantly. There are other reported advantages, water feels and look better, algae is prevented, etc.
    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

  9. Back To Top    #9

    Join Date
    Jul 2007
    Location
    North of Dallas
    Posts
    207
    Quote Originally Posted by JasonLion
    Quote Originally Posted by tagprod
    How do you add borates? My PH does a lot of climbing too.
    You add fairly large amounts of borax and enough acid to get the PH back to where it started. There is a calculation for the amount of borax and acid to use near the bottom of my pool calculator, see the link in my signature. The borates calculation in BleachCalc is wrong. Aim for 30-50 ppm of borax. There is some risk to pets if they drink large amounts of pool water. People, even kids, don't seem to be at any risk, but I would hesitate with infants.

    The borax will act as an additional PH buffer to slow the increase of PH. You will still need just as much acid as before, but you can add it all at once at quite long intervals, instead of adding it constantly. There are other reported advantages, water feels and look better, algae is prevented, etc.
    yea, i have a 9 month old and that was the main hesitant for me using it.
    My Pool - 18x24 fully setup Cabana, 22x48 gunite/quartz plaster (3-5-3 depth) & 8' spa w/ spill and 5' natural rock waterfall; Hayward DE filter/pumps/heater; Hayward Pro Logic controller; Phantom cleaner. Finished 06/01/07.

    RedishConstruction.com

Posting Permissions

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