The 2 Liter refill of the AquaFinesse Hot Tub Water Solution helps to eliminate the time consuming maintenance to keep your water clean and clear. The AquaFinesse Water Care System Features: Simple maintenance solution, Eliminates the time consuming maintenance process, Loosens biofilm to keep your water clean and clear, Can reduce chlorine usage buy up to 60%, Softens water for a more comfortable bather experience, and helps maintain water balance. Directions for use: (New Start-up or Maintenance) Step 1 - Balance pH. 2 - Add AquaFinesse per dosage amounts on bottle or found below. 3 - Open all jets and turn on the jet pump. 4 - Add the sanitizer of your choice per manufacturers instructions. Dosage Amount: 250 Gallons of Water = 6 Ounces; 251 to 350 Gallons of Water = 7 Ounces; 351 to 450 Gallons of Water = 10 Ounces; 451 to 550 Gallons of Water = 13 Ounces; 551 to 650 Gallons of Water = 14 Ounces