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Calculations for your pond are as follows, (Length)13' x (width)18' = 234, 234 x (avg depth) 2' = 468 x 7.48 = 3500 gallons of water. Stream calculates @ another 375 gallons total volume is almost 3900 gallons. Minnimum water circulation is 50% of volume. Depth of pump in pond is also included with head height ( 7ft )
Sugested pump is Tsurami 3500 gph this has a max head height of 12 feet @3500 gpm more efficient than others.
Aquascape does have the most efficient skimmer and falls system just specify a Tsurami pump. Any questions contact me.
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