I am going to be getting an approximately 500 gallon stock tank to use for my duck pool... I need ideas on how to make, or where to get.. a filter/pump system for it to keep it reasonably clean. Water isnt free anymore unfortunatly.. I know NOTHING about filter or pumps so all the help i can get is greatly appreciated... Home made jobbies are good too... Also need ideas on a ramp or deck to put around it.. I wont be putting it in the ground.. Thanks.