Pond Doctor Dave: Real-World Q&A on Pool-to-Pond Conversions

Three reader questions, practical answers from pond specialist Dave.

1. Converting a Neglected 18×36 ft Pool to a Natural Swim Pond

Reader: Retired teachers, limited budget, want swim area + planted zone + maybe koi.

Dave: Build a retaining wall inside the basin for a regenerative gravel zone (planted filter). Redirect plumbing to percolate up through gravel with aeration. See "swimming pond" and "easy pond aerator" pages. If no wall possible, use a conversion-style filter ("pool conversion" page). Fish and swimmers will mix—plan for that. Research the site thoroughly; problems are solvable.

2. Pump Pressure for 8″ Pipe, 40 ft Vertical Lift

Dave: Need ≥40 ft head pressure + pond depth, at your target GPM. See waterfall-pump page for sizing charts.

3. Waterfall Down a Natural Rock Face

Reader: Rock face as back fence; wants pond at base with water running down rock.

Dave: Dig behind rock face for liner, cement/seal liner lip at rock base. Use natural stone on other edges. Run flex pipe up and around rock face—hide it creatively. Study waterfall-pump page and site resources before starting.

Dave's site (pond-doctor-dave.com) is a deep resource—read before you dig.