OK guys I need some help. I need some advise on how to design a filter for the pond. I am thinking about basically making a traditional sump like for a aquarium but buried underground. I am gonna use a bottom drain system with the pump after the filtration. I have some ideas but would love to see what you guys have done. the pond I plan on building is about 1500 gallons according to one of the calculators I used. I cant really get any solid measuremets right now due to the fact I am on an aircraft carrier that is out to sea at this time. Also, how close is the closest that you would dig a pond next to your house? thank you in advance for all your help!