The storage tank is typically required to supply water from the system on demand. When you open your RO water dispenser the water is sent out by the tank's pressurized air bladder. The tank uses stainless steel connections to avoid any leaching concerns.

Water filter tanks are ideal for systems that produce clean water at a rate faster than it is being used or consumed. Storage tanks also reduce the time it takes for you to get clean water, since the unit already contains it, increasing the efficiency of your treatment system or well system.