I just use a large airstone. I have a good quality pump that has been running constantly for 4 years now. Waterfalls are not that hard to install. Here is my supply co.http://www.stoneycreekequip.com/. My pond pid is in their catalog on page 41. It is also on their web site under small ponds.It is about 15 or so from the first one. The only one with an archangel statue.My pump is a piston linear one.The whole kit including weighted hose and airstone is $396.
Shawna,My email is( rniederl@twcny.rr.com. ) Email me and I will send you pics of the pond being built.Look at the link, and ask for a catalog. You have to be careful with lillies as the can spread like crazy,especially with dirt bottums.Mine are in pots, which I put in the deep end to winter.Look on the site under just a falls,pro series. Mine is the aquafalls.