I found this page, looking for the CYA content of the chlorine tabs I bought in France:
Trouble is, I don't fully understand the numbers.
So Cl2 = 50 and trichloroisocyanuric acid (C3Cl3N3O3) =1934, but what? milligram? The tablets weigh 20 gram each, so they are 99% something else? That can't be true.NOM DATE SOCIETE CL2 PRODUIT AGR
CARREFOUR CHLORE PASTILLES 50/20 02/11/94 ELF - ATOCHEM 50 ACIDE TRICHLORO-ISOCYANURIQUE 1934
It probably is a relative number, independent of tablet weight. Also, the chlorine content varies with the same AGR (?) value. The Wikipedia entry of trichloroisocyanuric acid is probably written by a pool-chemicals salesman:
http://en.wikipedia.org/wiki/Trichloroisocyanuric_acidBenefits of TCCA in Swimming Pool- [sic]
* Available with 90% chlorine concentration
* Due to high chlorine content, handling is easy for large pools.
Can somebody explain to me how the chlorine concentration can vary in a pure substance with a known formula?
Or is this just more obfuscation from pool-chemical sellers?
I'm so happy I found TFP. I was wading through all kinds of stuff and outraged by the prices. Solid info was nowhere to be found. I'm still attending Pool School.