I got a 40 Gallon stock tank for my two ducks. Clean it every other day but with an old sump pump it spews the water out in less than 5 minutes (I want to say it only takes 2 but I am unsure). Once I get to the very bottom and the pump can suck the rest out I dump it and then refill- real easy and clean! Pond was at a local feed store, maybe $50, probably less. Seems durable too.