What is a pool skimmer and how does it work?

A pool skimmer, also known as an overflow drain, draws in water from the surface where leaves, pollen, and grease collect. It is a central part of the pool’s circulation and helps the filter capture contaminants before they sink.

Short answer: The water level should be within the skimmer’s operating range, the basket should be emptied regularly, and the suction should be balanced with the other outlets.

How a pool skimmer works

The pool pump draws water through the opening in the pool wall. A movable flap helps draw in the top layer of water and reduces the risk of debris floating back. Coarser dirt is trapped in the basket, while smaller particles continue on to the filter.

The cleaned water is returned through the inlets. When the inlets are set correctly, circulation is created that moves surface debris toward the skimmer.

Correct water level and flow

A level that is too low can cause the skimmer to draw air and the pump to lose flow. A level that is too high reduces surface flow and makes it easier for debris to pass by. Follow the level marking for your model and check the level after rain or refilling.

If the suction is weak, first check the basket, filter, valves, and the pump’s pre-filter.

Common problems

• The basket is full of leaves
• The skimmer flap has jammed
• The water level is too low or too high
• Air is entering through the lid or connection
• The inlets are directed so that surface debris circulates away from the skimmer

Care and winter

Empty the basket before it becomes full and inspect seals and plastic parts. During winter shutdown, pipes and components should be secured according to the pool’s design and local climate. Do not use plugs or winter solutions that do not suit the model.

Frequently asked questions

How many skimmers are needed?

It depends on the pool’s size, shape, flow, and placement. Sizing should be done together with the pump, filter, and inlets.

Can the pool robot replace the skimmer?

No. A pool robot mainly cleans the bottom and sometimes the walls, while the skimmer works with the surface water and is part of the circulation system.

Find skimmer and inlets that suit the pool’s design.