Hi.

No, I am not purposely seeking to use trichlor to maintain the chlorine level. I'm asking the following question for other reasons I can go into later.

I have read that for 1 ppm of chlorine generated by trichlor the CYA concentration increases by 0.6. However, I cannot make the math work so there is obviously something wrong in my assumptions.

So, I'm asking for corrections in my assumptions. Thank you.

Trichloroisocyanuric acid (aka trichlor) has a molecular weight of 232.41 g/mol.

Trichloroisocyanuric acid has 3 mol of Cl- per mol of acid

The dissociation of Cl- from the acid in contact with water is such that:

2 mol trichlor -> 2 mol CYA + 3 mol Cl2

The molecular weight of CYA is 129.07 g/mol and Cl2 is 70.9 g/mol.

Therefore, by weight in 1 L (aka ppm):

464.82 ppm trichlor -> 258.14 ppm CYA + 212.7 ppm Cl2

Dividing by 212.7 ppm Cl2 I get 1.2 ppm CYA for each 1 ppm Cl2

So.....what am I doing wrong??

Thanks.