The skylight in my signature is centrally located over my pool (2ft over 14ft pool length, 4ft over 6ft pool width, recessed 21 in. above pool room ceiling, ceiling 64 in. above water level). The amount of sunlight that hits the water is dependent on the time of year and day when I am using the pool and for how long, typically 30 minutes per day. Assuming that the pool cover will block sunlight from impacting the chlorine, what CYA level would you recommend?