Single treatment kills & prevents all types of algae growth for 3 months! Every three months: Add 14 fl. oz. 3 Month Algaecide per 10,000 gallons pool water will prevent algae growth in all pool types. Severe algae treatment: 28 fl. oz. 3 Month Algaecide per 10,000 gallons pool water. Add 3 Month Algaecide directly to the pool, distributing it over as wide an area as possible. 3 MONTH ALGAECIDE QT - 12/CASE PHOENIX (90 DAY ALGAECIDE) LIGHT, COPPER BLEND