Hello, i have a small pond and a small pool for my ducks. I am new to the duck world but i keep thinking ill have my husband dig a big hole with the backhoe and have this wonderful pond. But everything i read makes me think that is not neccesary. I dump the pool and pond every 2 days and refill. It takes me bout 20 mins and we are good to go. I just wanted to say im not going any bigger because this is really the easiest way i have found. Good luck.!!