There have been several threads talking about various products being offered as CYA removers or reducers and has been discussed at the following links on this forum:

Cyanuric Acid Reducer/Remover
Cyanuric Acid Remover
Is this possible?
Hardware Store selling CYA Remover
CYA Remover?

Carl and others speculated that melamine was the key ingredient in this reducing product. This patent from Applied Biochemists describes the use of melamine and a floc to remove Cyanuric Acid. In this post I traced down the ChlorMor to allchem.com which is AllChem Industries which is an importer of chemical raw materials. They may not be related, but it was interesting to find the patent nevertheless.

One thing inconsistent in the patent is that they show reductions to < 10 ppm CYA, but presumably melamine cyanurate has a solubility of around 20 ppm and Taylor Technologies had told me that for their CYA test they ensure full precipitation by using an acidic solution since the precipitate is essentially insoluble at low pH. The results in the patent are probably because they used CYA in distilled water which would have then been acidic (since CYA is acidic) as opposed to using pool water which is buffered for pH.

Richard