AMTROL has been manufacturing Reverse Osmosis Water Storage Tanks for over 4 decades. Not only has AMTROL been doing it longer than anyone else, AMTROL actually invented the technology behind RO tanks. AMTROL's proven technology, vast experience and countless other qualities are what place AMTROL high above other manufacturers. AMTROL tanks come with a five year warranty.

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The Amtrol RO-4 is a standard 4 gallon tank which can be used on any reverse osmosis system. In fact, any of Amtrol tanks can be used with any amtrol reverse osmosis system or compatible reverse osmosis systems.