CYA in a Bromine Pool

[chem geek]

I remember there was at least one SWCG pool owner who tried to use 3 ppm FC with 80 ppm CYA, but that wasn't enough to prevent algae growth. So the minimum recommendation is closer to an FC that is 5% of the CYA level (rounding up from my original 4.5%) so 4 ppm FC with 80 ppm CYA or 5 ppm FC with 100 ppm CYA. This is already lower than Ben's Min. FC for manually dosed pools, but going any lower than this may risk nascent algae growth.

[waterbear]

I have been running 3 ppm FC with 80 ppm CYA but I do maintain 50 ppm borates so that might account for it.

[chem geek]

Yup, the borates definitely take the edge off of algae growth as I've noticed in my own pool. This is consistent with the data in the text and in Table 18 in this link where 50 ppm seems to give a 50-70% inhibition in the rate of algae growth.

[waterbear]

This is consistent with the data in the text and in Table 18 in this link where 50 ppm seems to give a 50-70% inhibition in the rate of algae growth.

Funny how we seem to read the same papers.