I've been using this system, the one with the 3 gallon storage tank included, for a bit over a year now and it's worked great. My tank looks cleaner, my fish healthier, and my drinking water tastes better. Just remember to changed your filter every 6 months or so even tho it says it can go for a year. And buy the dang wrench too cause there's no way u can change the filter without it unless u have a really big wrench.. The only problem i have with it is that there's not enough pressure in the tank when im tryin to fill up my fish tank with water, so if i let ma fish drink...i cant basically. Also, my auto shut off valve malfunctioned and i had to purchase a new one...But for the price this is basically unbeatable. I dont see why every just dont buy this unit or one like this....If anything your gonna be healthier cause u wont mind drinkin water so much.
steve...IF your planning to drink, you would just drink 5 stages, the 4 filters and the reverse osmisis, there should be a seperate valve that goes up to your sink, for your fish tank, you would use the whole 6 stages including the de ionizer.
I'd say spend an extra 30 bucks and get the whole big package, its still much cheaper than else where...
hope this help u guyz...