I've had a pond on my property for 16yrs. I dig it out every few years and make it bigger. There's no liner. The ground on my property is all clay. I'm on a well so a little bit of leakage is no big deal. Up until this year it had no filter system. I would run fresh water in and it would overflow out into my garden. The pond was about 15ft in diameter about 3ft at the deepest. This year I dug it out to 25ft in diameter and 4ft deep. I've built a bog filter but haven't put any plants in it yet.
