Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 5 of 5

Thread: CYA precipitant

  1. Back To Top    #1

    Join Date
    Jun 2013
    Location
    East TN
    Posts
    309

    CYA precipitant

    You will just have to read for yourself.
    http://www.google.com/patents/US4793935

    Anyone care to elaborate?
    18,000 Gallon Aboveground. Sand Filter with 2HP 2 speed Pump.

  2. Back To Top    #2

    TFP Guide

    chiefwej's Avatar
    Join Date
    Jun 2011
    Location
    Tucson
    Posts
    2,853

    Re: CYA precipitant

    That is how we test CYA levels. Melamine is added to the water, which precipitates the CYA, and clouds the sample. We put it in the viewing tube to measure how cloudy. I assume the process would require a large quantity or very high concentrate of what we use as test reagent, then the percipient would be filtered out.
    chiefwej
    Tucson, AZ
    16x36 rectangular (19k) Pebble Tec play pool/spa, Pentair Intelliflo VS 011018, Super II 2hp (spa), Aqua Rite T-15 SWG, Pro Grid 60 DE, Hayward H400 & Heliocol Solar heating, A&A infloor system, fill water w/high CH and TA, 50 ppm borates,TF-100 test kit

  3. Back To Top    #3
    y_not's Avatar
    Join Date
    Jul 2012
    Location
    Redmond, OR
    Posts
    1,086

    Re: CYA precipitant

    This is extremely cool! I might actually try this if the need arises someday.
    Assuming the melamine isn't cost prohibitive.

    Curious as to the chart in the patent listing the concentrations as mg/l.
    Does that convert across the board to ppm, or is it different?
    Thanks for reading... - Tony
    Da' Pool: Intex 15'x42" 3284gal AGP EasySet (Inflatable Ring) - (Summer 2014: 27' round EW /w 6.5' deep end @ 22,500gal)
    Pump & Cart Mod: 1000gph Cart. 5ft² - 2 nylons, 24/7 OP. Traps bugs/bits, lasts longer/cleans easier = Happier Pool Owner!!
    The Bible for a "Trouble Free Pool" life = PoolSchool, the BBB method a TF100 test kit(Recommend Kits Compared). - Cleaning a Sand Filter
    Water looks like GLASS, if yours doesn't...SLAM IT! Feels nice and never been happier!!! :D

  4. Back To Top    #4

    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
    Posts
    12,082

    Re: CYA precipitant

    There was a product available in the past that did this -- used melamine to precipitate melamine cyanurate that reduced Cyanuric Acid (CYA) levels. The problem is that it makes a cloudy mess in the pool that takes a long time to filter out, though the use of some clarifier can speed up the process. However, what you are left with is a pool saturated in melamine cyanurate which in equal quantities and at pool pH is soluble to at least 20 ppm or more. The CYA test significantly lowers the pH to force more precipitate since the solubility is much lower at low pH.

    So what then happens is that any additional CYA that is added causes the pool to cloud up again since it's already saturated. So while this approach does lower the CYA level, it creates a situation where using any stabilized chlorine product that increases the CYA level causes the water to become cloudy. It might be possible to continually use a clarifier to try and sweep up any precipitate that forms, but this is dicey. Another approach would be to significantly lower the pH to force more precipitate to give some headroom for more CYA, but the amount of headroom is somewhat limited. This is why you generally don't see such products on the market anymore.
    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"

  5. Back To Top    #5

    Join Date
    Jun 2013
    Location
    East TN
    Posts
    309

    Re: CYA precipitant

    Looking at the toxic properties of melamine, that is probably why they dont make it any more. It appears that melamine cyanurate is more toxic than melamine.
    18,000 Gallon Aboveground. Sand Filter with 2HP 2 speed Pump.

Posting Permissions

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