OK not sure exactly how to clearly word this but I'll try. I just bought a 6 stage RO DI (Water General 106) system. There are many water lines. One for the water coming from the fauset, another for water going into a storage tank, another for waste water, another for drinking water, and lastly a line with water for the aquarium. My question... Why are there seperate lines for drinking and for the aquarium? Why are they seperate? Thanks.