Pool Algaecide HCT Approximately 1kg Natural Algaecide. Kills and Prevents Algae. Do not allow swimming in pool for at least 15 minutes after this product has been applied. Always apply this and other pool treatment chemicals separately. NEVER COMBINE THEM. Application: 0.3-0.4 ppm or 3-4 grams (1 teaspoon) per 10,000 liters of pool water Maintenance dose should be added weekly or after heavy or prolonged rainfall. Add 2-3 grams per 10,000 liters of fresh make-up water added. DIRECTIONS: Mix with water until all blue crystals have dissolved completely. Pour around the entire perimeter of the pool. KEEP OUT OF REACH OF CHILDREN Weight : 1kg