Does this compare to an RO / DI system meant for an aquarium? Would it clear all the purities out of the water for a mini reef aquarium? I keep purchasing water for my tank from a fish store and it is time I get my own system for my tank, and I came across the Watts Premier RO-Pure Advanced Filtration Process Reverse Osmisus System at a great price. But I do not want to put my tank into danger by using the wrong system.