Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 14 of 14

Thread: Anybody use a photometer to measure CYA?

  1. Back To Top    #1
    Major_in_MS's Avatar
    Join Date
    Jul 2016
    Location
    Florence, MS
    Posts
    92

    Anybody use a photometer to measure CYA?

    I was just wondering if anybody here has used a photometer such as this one

    http://hannainst.com/products/portab...hotometer.html

    to measure their CYA levels. If so, what was your impression of the meter/testing?

    As subjective as the current methods for CYA measurement is with different people perceiving the black dot differently with varying light and visual abilities I'm wondering if something like this is worthwhile.
    24,200 gal., IG vinyl, 18' x 36' rectangular, average depth 5'. K-2006C
    Jandy SFTM22 sand filter, 1 HP Hayward Super Pump, Doheny's Discovery Robot.
    One skimmer, one main drain, two eyeball jets, and one return from the booster pump.
    One wife of 26 years (schoolteacher, first grade), four kids (ages 14,16,17, and 19).
    I work night shift (Pediatric RN) so most of my posts will be during the night.

  2. Back To Top    #2
    Mod Squad YippeeSkippy's Avatar
    Join Date
    Jan 2012
    Location
    'burbs of Augusta, Georgia
    Posts
    6,464

    Re: Anybody use a photometer to measure CYA?

    We generally frown on meters to test chemicals with as they're only as good as the calibration, which needs to be performed properly each time its calibrated. And the price! Oy!

    I personally think it is easier to get the small sample bottle of CYA Test Reagent that has a known value and learn to read that then move on to your own pool water. Less than $10 for the test reagent, I think?TFTestkits.net
    My Amazon Smile for November12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Doheny Discovery Robot, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub.
    Our pool build--> Our Pool Solved Our Sloping Yard Skippy's Cheap Pool Cooler -->Skippy's New Fountain

  3. Back To Top    #3
    Patrick_B's Avatar
    Join Date
    Jun 2011
    Location
    Midland TX
    Posts
    15,001

    Re: Anybody use a photometer to measure CYA?

    Good photometers are excellent but quality instruments cost a good deal more than residential pool owners want to spend. For some tests, they aren't all that practical, such as Calcium hardness
    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

  4. Back To Top    #4

    AUSpool's Avatar
    Join Date
    Sep 2015
    Location
    Sunshine Coast, Australia.
    Posts
    351

    Re: Anybody use a photometer to measure CYA?

    At $220 it's kind of expensive for one test, probably better quality than a ColourQ but the ColourQ will do all the tests at arround the same price and inherent potential for error. At some point the light source will fade and the curettes will age which will affect the results without the user knowing.

    Quote Originally Posted by YippeeSkippy View Post
    I personally think it is easier to get the small sample bottle of CYA Test Reagent that has a known value and learn to read that then move on to your own pool water. Less than $10 for the test reagent, I think?TFTestkits.net
    I agree, a CYA standard solution is the term I think you were after. I have a 50ppm solution, and think it is a must for anyone new to this test. Once it's mixed 50/50 with the detection reagent, R-0013, and shaken for 30 seconds it can be used over and over to get the hang of the test.
    Steve.
    30,000L (8,000g) Pebblecrete | Davey 3sp Eco pump | Poolrite sand filter & SWCG |
    Waterco solar panels & Astral E140 pump| K2006, CCL reagents, BlueDevil pH, Salt meter & K1766 | Town water - pH 7.2, TA 50, CH 60 | Esky full of coldies |

  5. Back To Top    #5
    Major_in_MS's Avatar
    Join Date
    Jul 2016
    Location
    Florence, MS
    Posts
    92

    Re: Anybody use a photometer to measure CYA?

    Accuracy @ 25C (77F) 1 mg/L 15% of reading

    How would the accuracy/margin of error on this meter translate to ppm?

    And yes, at $220 it is rather pricey.

    I'll probably just order the 50ppm standard solution (or make some myself.) But then again, my wife tells me all the time that I love to spend money on my "Man Toys." eg. welding machine, wine/beer making equipment, beehives, etc.
    24,200 gal., IG vinyl, 18' x 36' rectangular, average depth 5'. K-2006C
    Jandy SFTM22 sand filter, 1 HP Hayward Super Pump, Doheny's Discovery Robot.
    One skimmer, one main drain, two eyeball jets, and one return from the booster pump.
    One wife of 26 years (schoolteacher, first grade), four kids (ages 14,16,17, and 19).
    I work night shift (Pediatric RN) so most of my posts will be during the night.

  6. Back To Top    #6

    AUSpool's Avatar
    Join Date
    Sep 2015
    Location
    Sunshine Coast, Australia.
    Posts
    351

    Re: Anybody use a photometer to measure CYA?

    The range and resolution are good. I read the accuracy as +/-1ppm +/-15%, so ar 60ppm that would be +/-10ppm and at 30ppm it would be +/-5.5ppm. So with a reading of 60ppm the actual concentration could be from 50 - 70ppm. If I'm right that's a bit poor but it's probably the nature of the test.


    A teacher and pedeatric RN, , my wife of 20 years has a pHD in children's literature and lectures in the same, it's more than a full time job.
    Steve.
    30,000L (8,000g) Pebblecrete | Davey 3sp Eco pump | Poolrite sand filter & SWCG |
    Waterco solar panels & Astral E140 pump| K2006, CCL reagents, BlueDevil pH, Salt meter & K1766 | Town water - pH 7.2, TA 50, CH 60 | Esky full of coldies |

  7. Back To Top    #7
    Major_in_MS's Avatar
    Join Date
    Jul 2016
    Location
    Florence, MS
    Posts
    92

    Re: Anybody use a photometer to measure CYA?

    Quote Originally Posted by AUSpool View Post
    The range and resolution are good. I read the accuracy as +/-1ppm +/-15%, so ar 60ppm that would be +/-10ppm and at 30ppm it would be +/-5.5ppm. So with a reading of 60ppm the actual concentration could be from 50 - 70ppm. If I'm right that's a bit poor but it's probably the nature of the test.


    A teacher and pedeatric RN, , my wife of 20 years has a pHD in children's literature and lectures in the same, it's more than a full time job.

    Thanks for the clarification on the accuracy. I think my eyes and the black dot have about that same margin of error, so I will stop looking for a better way to test CYA.

    Sherri, my wife, is so stressed about the rapidly approaching school year. Two and a half more weeks of life by the pool and she'll be back in the classroom.
    24,200 gal., IG vinyl, 18' x 36' rectangular, average depth 5'. K-2006C
    Jandy SFTM22 sand filter, 1 HP Hayward Super Pump, Doheny's Discovery Robot.
    One skimmer, one main drain, two eyeball jets, and one return from the booster pump.
    One wife of 26 years (schoolteacher, first grade), four kids (ages 14,16,17, and 19).
    I work night shift (Pediatric RN) so most of my posts will be during the night.

  8. Back To Top    #8

    Join Date
    Jul 2016
    Location
    France
    Posts
    1

    Re: Anybody use a photometer to measure CYA?

    Quote Originally Posted by Major_in_MS View Post
    I was just wondering if anybody here has used a photometer such as this one

    http://hannainst.com/products/portab...hotometer.html

    to measure their CYA levels. If so, what was your impression of the meter/testing?

    As subjective as the current methods for CYA measurement is with different people perceiving the black dot differently with varying light and visual abilities I'm wondering if something like this is worthwhile.
    I have started using LaMotte Colour Q test kit for the pools I look after, and so far it seems to be working very well. Like any kit you have to look after it and use properley, if you do then it will work for you. Yes they are expensive compared to strips, but get cheaper after initial purchase, the Colour Q does all the test I need, not just CYA, for less money than the product you stated. Keep the test tubes clean & change every season ( I got a set with the reagants kit I bought) But like most things in life what works for me may not suit you, happy pooling!!

  9. Back To Top    #9
    tfoggo's Avatar
    Join Date
    Jul 2016
    Location
    United Kingdom
    Posts
    12

    Re: Anybody use a photometer to measure CYA?

    I use this photometer (actually a slightly earlier version of it) and love it. It measures CYA as well as all other tests you're likely to need. It's expensive though and requires annual re-calibration by the manufacturer (which also costs). Bought it in a moment of weakness but haven't regretted it - I've used it pretty much daily for 4 years.

  10. Back To Top    #10

    Join Date
    Apr 2013
    Location
    San Diego, Ca
    Posts
    22

    Re: Anybody use a photometer to measure CYA?

    I bought a turbidity meter on Ebay for a few dollars. I looked up on another post the correlation between NTU units and CYA. I also made up calibrated solutions and found the CYA to be very accurate based on the NTU measurement. It was much more accurate and repeatable than the drops. I am not too sure how the photometer works, but I suspect that it is similar to my turbidity meter. I hope this helps at least a bit.

  11. Back To Top    #11

    Join Date
    Dec 2014
    Location
    Santa Ana, CA
    Posts
    523

    Re: Anybody use a photometer to measure CYA?

    Quote Originally Posted by del View Post
    I bought a turbidity meter on Ebay for a few dollars. I looked up on another post the correlation between NTU units and CYA. I also made up calibrated solutions and found the CYA to be very accurate based on the NTU measurement. It was much more accurate and repeatable than the drops. I am not too sure how the photometer works, but I suspect that it is similar to my turbidity meter. I hope this helps at least a bit.
    how much were few dollars? Could you provide more details?
    44k plaster pool, Pentair 011018 pump, DE6020 filter, LED lights, K2006 test kit

  12. Back To Top    #12

    Join Date
    Jul 2014
    Location
    Hope Mills, NC
    Posts
    556

    Re: Anybody use a photometer to measure CYA?

    Quote Originally Posted by max2k View Post
    how much were few dollars? Could you provide more details?
    Any one I can find is nearly $2000.

    That's a lot of 50ppm sample bottles worth.
    16 x 32 17500 gallons
    Vinyl in-ground
    Hayward 250# Sand Filter
    1 HP Pump
    Hayward SWG

  13. Back To Top    #13

    Join Date
    Apr 2013
    Location
    San Diego, Ca
    Posts
    22

    Re: Anybody use a photometer to measure CYA?

    I think that I paid under $20 for it on Ebay. I had to replace a light bulb and I had to buy a new test tube. Still, I doubt I had much over $50 in it. Again, it works just great.

  14. Back To Top    #14

    Join Date
    Dec 2014
    Location
    Santa Ana, CA
    Posts
    523

    Re: Anybody use a photometer to measure CYA?

    Quote Originally Posted by del View Post
    I think that I paid under $20 for it on Ebay. I had to replace a light bulb and I had to buy a new test tube. Still, I doubt I had much over $50 in it. Again, it works just great.
    have you got a chance to calibrate it? Like buying known concentration solution(s) and see what it shows? When some meter shows some numbers they're just that- some numbers unless it comes with very solid spec and produces consistent results on standard solutions. That usually comes with matching price tag, that's why I'm asking so many 'validation' questions in case you came across more affordable unit. +- 5% in 30-100 ppm range would be quite useable. If the manufacturer is serious and understands relation between accuracy and resolution such device wouldn't be showing ridiculous values like 33.5 ppm . 30-35-40... is all we need, 2 digit indicator would be quite enough.
    44k plaster pool, Pentair 011018 pump, DE6020 filter, LED lights, K2006 test kit

Posting Permissions

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