A selection of reverse osmosis water storage tanks with internal butyl diaphragm are manufactured from food grade and FDA approved materials. NSF 61 and 58 listed.
A selection of steel tanks, plastic tanks and stainless steel tanks available.
Please note when selecting tanks consider that the actual available water capacity is only about 50% of vessel volume. The actual water capacity is also dependent on the bladder pressure ( 50 kPa) - this pressure should be measured when the tank is empty!