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If the pond is of large enough scale, you can build your own biofalls out of liner. It takes the form of Malrex's example - you create a sunken box from earth and/or stone, feed the pump hose into the bottom of it, fill it with successively smaller stone sizes as you fill, right up to the weir stone. It's identical to a biofalls but on a larger scale. No special fittings needed, though you could use Aquascapes centipede to exhaust the water into your biofalls box (or buy a piece of corrugated PVC with a cap and cut some slots - save about $400).
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