So, meaning you put water in a tank, install a filter and you don't need to change the water... THAT'S TOTALLY AMAZING!! because I have never kept a fish so, I never had a straight idea of how a filter really worked. So, I install a filter clean the filter everyday, right? That's it? So no dumping out water and filing more in. And another thing, when do I need to actually change the water? Is it necessary or do I just have to use the filter and its done, no water changing? Oh! And a filter works through electricity or is there a battery in it? THIS IS REALLY GETTING ME EXCITED!! Please pray i get to buy them sooon!