Naturalizing a Preformed Pond with Rocks: Filtration and Mosquito Concerns

Liner Protection

Preformed plastic liners degrade under UV. Covering with rocks shields the liner, extending its life.

Stagnant Water = Mosquitoes

Without a pump/filter, the pond becomes a mosquito factory. Install a pump with a fountain head or small waterfall. Add a skimmer box to remove surface debris.

Filtration

A simple box filter (PondMaster, Tetra) with a UV clarifier keeps water clear and reduces mosquitoes. Easy to install.

Rock Placement

Use smooth river rocks. Avoid sharp edges against the liner. Mortar is not needed; gravity and friction hold them.