Rainwater is a sustainable source for our water needs. It is free and endless. The Waterwall Fatboy tank is the perfect tool to use in saving your rainwater and to save huge amount of money from your water bill. The waterwall tanks can hold up to 650 gallons of water despite of it being just two feet wide. Light is prevented from entering the tank to prevent algae from growing using the UV stabilized high-density polyethylene. It also has thick walls to ensure that the tank is sturdy enough for use for a long period thus longer chance of saving money from water usage.