All the info I can find these days says "drain and refill the pool" to lower the cyanuric acid level. However, that course of action is unacceptable. My pool is 34,000 gallons (in-ground), and was ...

A six-membered heterocyclic ring, cyanuric acid, C 3 N 3 (OH) 3, and its derivatives are often used as polymer cross-linking agents and to make industrial chemicals such as herbicides and dyes ...