Platy makes a gravity filter that hangs instead of trying to sit it on a flat or smooth surface. I think that it is pretty new but I was surfing the other day , I think it was on Amazon.com where I saw these things. It looked like two identical bottles with hose and filter in between. Looks pretty simple to me and if my memory serves me correctly (which it probably doesn't) it claim 2 liters of water every 5 minutes. Again this might not be the exact amount but when I was reading it, it seemed like that it's claim was pretty fast comparably speaking...Hope that helps...sabre11004...

The first step that you take is one of those that get you there !!!!!!