Installation Case 2 : Undersink Reverse Osmosis System for Fish Farm First step is connect the inlet join. Install the main reverse osmosis system. This is ro water storage pressure tank 4 gallons. Switch on the power supply. Completely installation. This customer is fish farming member. Bottled Ro Water Delivery, Free Hot Cold Water Dispenser for Used Rental Servicing Case 1 : Plan35 2nd Services for Yamada 389-20 Hot Warm Cold Water Dispenser