Overflow vs Skimmer

A well-designed swimming pool starts with understanding your home and the way you live. One of the most important decisions before construction begins is choosing between an overflow system and a skimmer system. This choice affects the pool’s appearance, space requirements, construction budget, and long-term maintenance. Understanding how each system works will help you plan with confidence and choose a swimming pool that suits your needs from the outset.

How Does an Overflow Pool Work?

An overflow swimming pool is designed with the water surface close to or level with the designated overflow edge. Water flows over this edge into an overflow channel before entering a balance tank. The circulation pump then draws water from the tank, sends it through the filtration and water treatment systems, and returns it to the pool through the return inlets. The balance tank plays an essential role in accommodating changes in water volume and supporting consistent system operation.

One of the defining features of an overflow pool is its high water level, which creates a smooth visual connection between the water, surrounding deck, and architectural elements. This makes it an appealing choice for homeowners who want their swimming pool to be a prominent part of the overall design. Where the property offers attractive views, one or more overflow edges can be designed as an infinity edge, creating the impression that the water extends into the garden, mountains, or horizon. However, an overflow pool does not have to be an infinity pool: overflow edges and collection channels can be incorporated into a variety of designs.

Beyond its visual appeal, a properly designed overflow system can efficiently direct surface water into the treatment system. This is important because many contaminants, including those introduced by swimmers, tend to accumulate at or near the water surface. Effective surface water removal depends on the overflow edge design, circulation flow rate, and distribution of water returning to the pool.

How Does a Skimmer Pool Work?

A skimmer swimming pool, on the other hand, draws surface water through skimmer openings installed in the pool walls. Water and floating debris enter these openings, where a basket captures leaves and other larger particles. The water then passes through the filtration and water treatment systems before returning to the pool. This system generally does not require a perimeter overflow channel or a balance tank. Its water level sits below the pool edge and must be maintained within the operating range specified for the selected skimmer.

With fewer system components, a skimmer pool is a practical option for many homes, particularly where controlling the construction budget or making efficient use of limited space is a priority. Without an overflow channel and balance tank, certain construction requirements are reduced, and there are fewer additional areas to maintain. A skimmer pool can also complement the architecture of a home beautifully through thoughtful choices of pool shape, coping materials, tiles, and landscaping.

Construction Cost and Balance Tank Planning

When comparing construction costs, a conventionally built overflow pool will generally require a higher investment than a skimmer pool of a similar size with comparable materials and equipment. The additional cost comes from the overflow channel, balance tank, pipework, and water level controls, together with the structural work, waterproofing, and precise levelling required along the overflow edge. The price difference therefore reflects the additional components and construction detail involved.

Planning the balance tank should begin during the design stage. Its capacity needs to account for water displaced by swimmers, water draining back from the channels and pipes when the system stops, and the operating water level required by the pump. The tank should therefore be sized according to the conditions of each individual pool. Convenient access for inspection, cleaning, and maintenance should also be incorporated into the design.

Long-Term Maintenance and Hydraulic Design

For long-term care, both systems require regular cleaning, equipment inspections, and water quality management. A skimmer pool requires routine cleaning of the skimmer baskets and attention to the water level. An overflow pool also requires inspection and cleaning of the overflow channels and balance tank. Allowing contaminants to accumulate in these areas can affect system hygiene, making maintenance access just as important as equipment selection.

Whichever system you choose, pool performance depends on the hydraulic design of the entire circulation system. This includes the positions of water collection points and return inlets, pipe sizes and routes, and the selection of compatible pumps, filters, and water treatment equipment. If these elements are not properly coordinated, some areas may receive insufficient circulation, debris may remain on the surface, or equipment may consume more energy than necessary.

Which System Should You Choose?

Choosing an overflow system solely for its high water level, or a skimmer system based only on its initial construction cost, may therefore overlook other important considerations. Homeowners should also evaluate the pool’s size and shape, expected number of swimmers, surrounding environment, available space for equipment, and preferred approach to ongoing maintenance.

If you want the water surface to be a distinctive architectural feature, prefer a water level close to the pool edge, and have sufficient space and budget for the additional infrastructure, an overflow system can be an excellent choice. For homeowners who want a swimming pool for everyday use, value a simpler system, and wish to manage space and budget efficiently, a skimmer system is also well worth considering. Both can provide an enjoyable swimming experience when properly designed and maintained.

The pool’s design, circulation system, filtration and water treatment equipment, plant room, and maintenance access should all be planned together from the beginning. Altering the system after the structure has been built and the pipes installed is often difficult and can add considerable expense. Making these decisions during the design stage helps create a swimming pool that looks beautiful, works effectively, and remains practical to maintain throughout its life.

POOL&SPA provides expert guidance on selecting and designing a swimming pool system that suits your space, needs, and budget, ensuring that every component works together from the very first stage of planning.