Building a Patio Pond: Step-by-Step Guide

Project Overview

4×4 ft, 2 ft deep (~240 gal) on a brick patio, corner location near outlet. Brick patio and house walls provide two sides.

Construction Steps

1. Excavate: Dig 6×6 ft area, 3 ft deep (allows for base, walls, and liner).
2. Base: Pour 9-inch reinforced concrete slab.
3. Walls: Build 12-inch thick brick walls on all four sides. On one wall, install 50mm inlet pipe 6″ above base. Opposite wall: 63mm outlet pipe for circulation.
4. Waterproofing: At wall-base joint, embed wire mesh and apply waterproof plaster. Line interior with pond-safe tile or EPDM liner (simpler).
5. Filtration: Install ⅓ HP pump in bottom chamber → filter → UV clarifier → return to pond.
6. Electrical: GFCI outlet, outdoor-rated wiring, pump cord protected.

Finishing Touches

• Add marginal plants in baskets (iris, pickerelweed).
• Submerged oxygenators (anacharis, hornwort).
• Floaters (water lettuce, hyacinth) for shade.
• Stock with 3–5 small goldfish or rosy red minnows initially.

Simpler Alternative

Use a preformed pond liner or large stock tank on the patio—no excavation, just level sand base. Still needs pump, filter, and plants.