Considering RO or RO/DI water for your saltwater or reef tank? Spectrapure is the best of the best and we now offer several product lines - Marine Pro, Maxpure and Maxcap - at a range of prices and capacities. Trusted since 1985 by marine research labs, public aquaria & universities, Spectrapure is the leading innovator in RO & RO/DI systems and we are pleased to offer them at highly competitive prices for affordable tapwater filtration.