Abstract: A water filtration system for preventing a Zebra Mussel from entering a water system having a water intake line extending into an aquatic environment exposed to Zebra Mussels. The system contains an intake line connection for connecting the filtration system to the intake line; at least one water collection line extending from the intake line connection; a water intake line which is disposed sub-statantially parallel to the water collection line and which contains an orifice with a top surface and a copper screen recessed at least about 2.5 inches from the top surface; a first water filter and a second water filter, wherein each of these filters has a largest pore size that is small enough to prevent passage of an egg or veliger of Zebra Mussels; a a copper screen surrounding each of the first water filter and said second water filter; and a housing surrounding each of the water filters and including a first filter intake and a second filter intake.