My dad recently setup a plastic duck pond in the backyard. He has a water heater to keep water from freezing. He mentioned the water is pretty dirty (mostly mud/dirt sedament. He inquired to me about a proper pump with filter. After looking online I realized I have no clue what to search for. He is hoping for a pump with filter he can just drop inside the pond and it will filter the water. Anyone able to link me to a complete setup from amazon? Setup needs to include pump/filter that will submerge in 16" of water. Thank you so much.