DUO-Flo reverse osmosis tanks feature self-cleaning action, which results in a longer, eco-friendly product lifecycle. There is no more replacing liners every few years due to bacteria buildup; in turn, less tanks and liners in landfills. The tank’s unique flow-through design eliminates standing water. It uses two 1/4-in. stainless steel connectors that incorporate the company’s patented LeakSafe technology.