With the right fittings I imagine you could hook one up to a garden hose but the whole point of having a WC'r is so that it can be used from inside the house.
Phin I have mostly large tanks including a 220g which is a show tank that sits out for display so that method would not work well from an aesthetic point of view. I use a water changer which works just fine. Remember Dustin has his tanks in the basement and has a ton of them so he's looking for ways to cut down on manual WC's. I bet he doesn't have one in the 125 he keeps upstairs in his living room (if he still has it).
Phin I have mostly large tanks including a 220g which is a show tank that sits out for display so that method would not work well from an aesthetic point of view. I use a water changer which works just fine. Remember Dustin has his tanks in the basement and has a ton of them so he's looking for ways to cut down on manual WC's. I bet he doesn't have one in the 125 he keeps upstairs in his living room (if he still has it).