You will just have to read for yourself.
http://www.google.com/patents/US4793935
Anyone care to elaborate?
http://www.google.com/patents/US4793935
Anyone care to elaborate?
CYA precipitant
- Thread starter easttn
- Start date
- Jun 12, 2011
- 3,761
- Pool Size
- 19500
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pureline Crystal Pure 60,000
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.
y_not
0
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?
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?
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.
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.
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.
