I have a five foot kiddy pool for five ducks. I have built a biofilter using a five gallon bucket, charcoal, sand and gravel. I filter through about fifteen gallons a day but... I am still smelling the pond and don't want the neighbors to call animal control. I don't have access to unlimited water so changing it every three days isn't practical. Am I just not filtering enough? Can I add something to the water to help the smell?
Oh, btw I live in a small city on about .25 acre.
Oh, btw I live in a small city on about .25 acre.

