Was filling the pond up this morning (well topping it off) so i turned on the hole and stuck it in my little homemade filter box. Just remembered to turn it off....like 3 hours later. I only needed like 20 gallons. Pond water is really clean now...i think i replaced it all...just overflowed over the edges... Hope the fish live. Will piss me off if they die. I have had them for 2 year, and 1 winter