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Built my own pond/waterfall 5 years ago with four layers of silo-cap (used to cover crops) and a liner reservoir gathering pond at the top of my watefall-stream system. It's rocked in. Maintenance free since then...the discharge hosing drops directly over the top edge of the gathering pond and is covered with rock. No biofalls, no plumbing to speak of. That said, I wouldn't use such a technique for a client because of the danger of product failure. I found the biofalls unit pricey but useful. The Aquascape bulkhead fittings are garbage...they feel like a cheaper, more brittle PVC formulation (hunch).
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