1) Enter in feet how wide your planned or current waterfall is of the lowest flowing tier. 2) Choose the thickness of water flowing over fall in inches from dropdown menu. 3) Choose the Pump style either inline oustide of fountain or submerged in water. 4) Enter the amount of pipe to be used or enter pipe in feet already installed. Note: At the bottom of pump recommendation chart there is also a pipe size recommendation BUT many installations have the incorrect pipe installed meaning to small so you just have to live with the flow you get because ripping out the old pipe isn't worth it.
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