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

Thread: Make my own 50ppm cya calibration?

  1. Back To Top    #1

    Join Date
    Jan 2015
    Location
    Phoenix, AZ
    Posts
    27

    Make my own 50ppm cya calibration?

    New pool owner here...I ordered my tf100 test kit a couple of weeks ago, but have been having trouble building confidence in my ability to measure cya accurately. I wish I had known about the 50ppm cya standard calibration fluid when I ordered, but I didn't, and alas now including shipping, it's a bit pricey.

    I have a suspicion that I will have to increase my cya anyway, so I thought that maybe I could buy a jug of stabilizer and create my own 50ppm standard. Is this possible? If so, how can I do it!

  2. Back To Top    #2
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    Location
    DFW, TX
    Posts
    23,994

    Re: Make my own 50ppm cya calibration?

    1/10th of an ounce, or 2.83 grams, of CYA in 15 gallons is 50 ppm. Maybe have a look at this page first, I found it to be helpful.

    https://www.taylortechnologies.com/C...P?ContentID=36
    TFP Moderator
    If TFP helped you or saved you money - Become a TFP Supporter! <--Click here
    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

  3. Back To Top    #3

    Join Date
    Jan 2015
    Location
    Phoenix, AZ
    Posts
    27

    Re: Make my own 50ppm cya calibration?

    Quote Originally Posted by pooldv View Post
    1/10th of an ounce, or 2.38 grams, of CYA in 15 gallons is 50 ppm. Maybe have a look at this page first, I found it to be helpful.

    https://www.taylortechnologies.com/C...P?ContentID=36
    Thanks for the quick reply! Quick correction in case someone else needs this info. The calculation should be 2.83 grams, not 2.38 grams. You transposed the last two digits.

    This also assumes 100% pure CYA. Is the stuff we buy at the pool store typically 100% pure?

  4. Back To Top    #4
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    Location
    DFW, TX
    Posts
    23,994

    Re: Make my own 50ppm cya calibration?

    Dang it! I fixed my post. Some of it is 99% and most is 100%.
    TFP Moderator
    If TFP helped you or saved you money - Become a TFP Supporter! <--Click here
    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

  5. Back To Top    #5
    Patrick_B's Avatar
    Join Date
    Jun 2011
    Location
    Midland TX
    Posts
    15,001

    Re: Make my own 50ppm cya calibration?

    This test is one people tend to overthink. I admit, it can be easy to do, but trying to minimize that will be very helpful in the long run.
    TFP Moderator
    Essential Links:
    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

  6. Back To Top    #6

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,078

    Re: Make my own 50ppm cya calibration?

    1/10th of an ounce, or 2.83 grams, of CYA in 15 gallons is 50 ppm. Maybe have a look at this page first, I found it to be helpful.
    So, how do you intend to mix up 15 gallons of water and 1/10 oz CYA?

    I can see the 15 gallons but if you miss your .1 oz of CYA by 10%, your test is off by that much. It takes a fairly good, calibrated scale to give you .1 oz that you can tr7uly depend on.

    My guess is it would be a lot more reassuring to get the Taylor Standard Solution (about 8.50, I think) but it's up to you to decide which best suits you.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  7. Back To Top    #7

    Join Date
    Jan 2015
    Location
    Phoenix, AZ
    Posts
    27

    Re: Make my own 50ppm cya calibration?

    Quote Originally Posted by duraleigh View Post
    So, how do you intend to mix up 15 gallons of water and 1/10 oz CYA?

    I can see the 15 gallons but if you miss your .1 oz of CYA by 10%, your test is off by that much. It takes a fairly good, calibrated scale to give you .1 oz that you can tr7uly depend on.

    My guess is it would be a lot more reassuring to get the Taylor Standard Solution (about 8.50, I think) but it's up to you to decide which best suits you.
    My strategy was to mix up a 'super solution' of maybe 1L that has a very high CYA level, and dilute from there to achieve 50ppm. I have several scales that can measure down to +/- 2mg for my business, so I am confident I can measure the CYA accurately. I was more annoyed with myself that I didn't know about the solution when I placed my order, so this oversight on my part would mean me having to pay shipping twice and wait around for it to come. For that same money, I can buy some CYA (which I think I need anyway). This will allow me to save money and, more importantly, will allow me to run the test today rather than wait for the mail to show up.

Posting Permissions

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