Natural Swimming Pond Project in Cornwall

Natural Swimming Pond Project – Cornwall

Natural swimming pond construction in Cornwall

A natural swimming pond with planted regeneration and dependable water treatment

This Cornwall project transformed a previously excavated site into a substantial natural swimming pond. The design combines a dedicated swimming area with planted regeneration zones, wildlife-friendly margins and supporting mechanical filtration—creating water that can be enjoyed by people while remaining closely connected to the surrounding landscape.

Project snapshot

LocationCornwall

Project typeNatural swimming pond

Starting pointPreviously excavated site

WaterproofingProtective underlay and EPDM liner

Water treatmentPlanted regeneration plus mechanical filtration and UV

Access provisionPrepared pads for bridge and pontoon

The brief

The aim was to create a pond that looked and felt natural, offered a useful swimming stretch and provided extensive aquatic habitat. Because the initial excavation was already in place, the first task was to turn its rough shape into a buildable design with the correct levels, shelves, depths and structural zones.

Re-grade the existing excavation into clear swimming and regeneration areas
Create shallow shelves and varied margins for aquatic planting
Prepare stable locations for the bridge and pontoon
Install a reliable lined structure and stone retaining details
Combine biological regeneration with controllable supporting filtration

Shaping the pond

The excavation was carefully reworked with a digger to create the swimming depth, shallower planted areas and changes in level needed across the pond. Dedicated pads were formed for the bridge and pontoon, providing practical access without compromising the softer, naturalistic outline.

Existing excavation at the start of the Cornwall natural swimming pond project

Re-grading the swimming pond excavation with a digger

Creating the water-retaining structure

Once the levels and shape were agreed, protective underlay and a robust EPDM liner were installed. Washed gravel and carefully placed stonework created retaining features and defined the planted regeneration zones without making the pond feel over-engineered.

Underlay, liner and stonework being installed in the swimming pond

Gravel regeneration areas and stone retaining work during construction

A hybrid approach to water quality

The regeneration zones were filled with washed gravel and aquatic plants so that their root systems and associated microorganisms could contribute to biological treatment as the planting matured. Mechanical filtration and UV were incorporated to provide additional control and support consistent water quality.

Two Evolution Aqua K1 Micro bead filters
Two Evolution Aqua Vari pumps
One Evolution Aqua Evo UV unit

Mechanical filtration equipment for the natural swimming pond — Supporting filtration was incorporated discreetly alongside the planted regeneration system.

The result

The finished pond provides a generous open-water swimming area, planted shallows and a natural stone edge that blends into the rural setting. As the aquatic planting establishes, the pond continues to soften and develop as habitat while the filtration system offers practical control over circulation and water quality.

A dedicated swimming stretch for regular use and relaxation
Regeneration zones designed for reeds, lilies and other aquatic planting
Shallow wildlife access points and varied marginal habitat
A combined biological and mechanical treatment strategy
Bridge and pontoon access integrated into the original design

Later view of the established natural swimming pond in Cornwall — A later view showing the pond settled into its landscape.

Planning a natural or hybrid swimming pond?

SAS Aquatics designs new natural and hybrid swimming ponds and helps assess existing ponds or pools for conversion. Each scheme is developed around the site, intended use, water treatment, planting, access and the level of maintenance the owner is comfortable with.

Discuss your swimming-pond project

Tell us about the site, approximate dimensions and how you want to use the water. Include photographs or plans if you have them.

Start a swimming pond enquiry

Behind the build: even the dogs contributed some determined site supervision.