Oxidation of Cyanuric Acid with Hypochlorite

[Okoth]

Since I can't measure the CYA I have to estimate it. I'm trying to understand this study: http://www.poolhelp.com/wp-content/uploads/2017/05/JSPSI_V4N2_pp23-28.pdf
but I hope that someone can explain it in Sesame Street language so I'll understand it.

I know it's an estimation and even then it might be far off the real numbers (but it's better than nothing), but how much CYA is oxidated by sodium hypochlorite on a daily base when the water temperature is about 28 degrees Celsius?

The calculated CA loss rate using equation 7 is 0.87ppm/day at 85°F and an average of 4 ppm av. Cl. Data obtained for a sample of swimming pool water (4 ppm av. Cl, 138 ppm CA) at the same temperature showed a lower decomposition rate of 0.24 ppm/day at a ten-fold lower av. Cl/CA mol ratio of 0.06.

Would it be safe to say that the oxidation is around 0.25 ppm a day?

[Teapot1]

Yes around that, I had to reduce the CYA in a pool that measured 200ppm. Couldn't partially drain and refil because the drain ran into the high street and someone may have noticed 60m3 of water.
Took the chlorine very high and kept it there until we got the CYA down to 50ppm. A lot more expensive than changing the water! Still no algae for a while and his sister too about 3 months to the CYA back to 100ppm despite instruction to only use liquid chlorine, she was just a lazy puck type of person.

[Okoth]

she's even crazier than I.

Okay thanks again.