Infinity, zero entry or wet edge: how water leaves a pool on a waterfront lot

On a waterfront lot, the pool is always in conversation with something larger: a bay, a canal, a channel, the Atlantic. The most important decision in that conversation is the edge, meaning the place where the pool stops and everything else begins. Pool Tech builds infinity, zero entry and wet edge pools, and each one answers a different question about how you want the water to meet the property.

Infinity edge: the pool that borrows the horizon

An infinity edge, also called a vanishing or negative edge, lets water spill over one side of the pool into a hidden catch basin, then pumps it back. From the right spot the pool surface appears to continue into the water beyond. It is the most dramatic edge there is, and it is also the one with the most going on out of sight.

The weir, the lip the water runs over, has to be dead level along its entire length. A variation of a few millimetres shows up as a ragged sheet of water instead of a clean glass line. The wall behind the weir carries structural loads that a normal pool wall does not. The catch basin must be sized to hold the water that drops back when the pumps shut off, and the plumbing for its return needs its own thought. On a lot with a long view, an infinity edge works hard. On a lot where the neighbour's dock sits right behind the vanishing line, it can frame the wrong thing.

Zero entry: the pool you walk into

A zero entry pool, sometimes called a beach entry, slopes from the deck into the water the way a shoreline does. There are no steps to negotiate. Small children can wade in, older family members can enter without a rail, and anyone using a mobility aid has an easier time getting to the water. It also gives you somewhere natural to place loungers partly in the shallows.

The trade-off is footprint. A gentle slope takes a lot of horizontal distance, so a zero entry pool asks for more surface area than a pool with a conventional step shelf. Shallow water also warms and cools faster than deep water, which most people find pleasant in winter and less pleasant at the height of summer. Where the lot is narrow, a sun shelf, a broad shallow ledge in the pool, can do part of the same job in less space.

Wet edge: water level with the deck

A wet edge pool brings the water surface up to the level of the surrounding deck, so there is no visible coping or drop. Water brims over the perimeter, or part of it, into a channel or grate and returns to the system. It reads as a flat plane of water laid into the stone, and it works well when the house is architecturally clean and the deck material deserves to be seen.

Because the water sits at the same level as the deck, wind pushes it onto the stone and the edge takes more attention in design. The channel must catch what overflows. The deck must be set to a tight tolerance. And since swimmers can lean directly on a stone surface, the finish has to be comfortable against skin.

Questions to answer on site

• Where will you stand when you want the pool to look its best, at the dining table, in the kitchen, on the terrace, or in the water?
• What lies directly beyond the edge: open water, a seawall, a neighbour, a boat slip?
• Who swims here, and do any of them need an easy way in?
• How much of the lot can the pool take without crowding the deck and the outdoor living area?
• Which finishes need to line up with the pool edge, such as stone, tile or the water line of the house?

Waterfront conditions that affect all three

Wind off open water carries spray and salt, and it pulls water over any edge that spills. Ground on a waterfront lot tends to be low and wet, which has consequences for the pool shell and how it is built. Reflections change what the edge looks like through the day: at noon the surface may be a mirror of the sky, at dusk it takes the colour of the house lighting. A good design is checked against all of that at different hours, not only on a drawing.

These are not problems to avoid. They are the reason a waterfront pool, done properly, feels like part of the place. Pool Tech's residential portfolio includes the Key Biscayne Residence, the Gables Estates Residence and the Islamorada Residence, and the Custom service lists Infinity, Zero Entry & Wet Edge alongside Lagoon & Freeform, Acrylic Pool Features and Deck Jets & Bubblers as options to be designed around your property.

If you are weighing one edge against another, walk the lot with a builder before settling. The Custom service page explains how Pool Tech approaches a design made to fit a particular client and property, and the Pinecrest office is at 305.226.7510.