Skimmer Equipment /
What Is a Pool Skimmer and How Does It Work?
A pool skimmer is the surface-intake part of a swimming pool’s circulation system. It traps floating debris before it sinks and helps the pool stay cleaner.
Archive date: this article was written for PoolSkimmer on Oct 7, 2026 and given the earlier archive date of Feb 15, 2026 so the blog reads as an organized archive. It was not published on that date.
Understanding the pool skimmer
At its core, a pool skimmer is the aperture at the waterline that feeds surface water into the circulation system of your swimming pool. The function is straightforward: to take leaves, pollen, grass and the like off the top of the water before they have a chance to sink. It is worth noting that a skimmer is not a sanitizer in any sense; it will not stand in for adequate chlorine or other forms of water treatment.
Spotting the skimmer is easy enough. On an in-ground pool, one will usually find a rectangular or square opening set into the wall near the top. For above-ground models, it tends to be a boxy fixture on the side. Do not confuse this with a handheld skimmer, which is simply the net on a pole for manual work.
The mechanics of a skimmer
The built-in variety operates on the suction provided by the pool pump. As water is drawn through the opening, any floating matter is pulled to the mouth of the skimmer and caught in a basket so it does not make its way to the filter or pump. There is also a small floating weir inside; this flap serves to regulate the flow at the surface for better efficiency, provided the water level is correct.
In normal operation the process is as follows:
- Debris makes its way across the water
- Water is taken in at the skimmer
- Anything of size is held back by the basket
- The rest goes to the pump and filter to deal with fine particles
Components at a glance
Once you know what to look for, the parts are self-evident. You have the lid or cover on top, the opening at the waterline, the floating weir at the front and the basket within the housing. They are all there to take some of the load off the circulation system by clearing the surface.
Built-in compared to handheld
There is a distinction between the two. A built-in skimmer is integrated into the plumbing and does its job of continuous skimming whenever the pump is running. The handheld type is a manual tool for the pool owner to do some spot cleaning in corners or after a windy day when the built-in unit has left something behind. One is for ongoing maintenance, the other for a quick tidy up.
Maintenance and what to avoid
Any time you go to empty the basket or inspect the unit, the first step is to shut down the pump. Put on appropriate PPE and refer to the manual. Under no circumstances should one put a hand into equipment under suction or attempt to clear moving parts.
Some owners make the error of letting the basket get clogged, or they overlook a missing weir. Others mistakenly think the skimmer is doing the sanitizing. And if the water is unsafe, or there is odd suction or an electrical concern, do not enter the pool.
Time to get professional help
If the skimmer is not drawing water as it should, or you notice a crack in the housing, air in the system or a broken weir, put in a call to a pool pro. The same applies to any suspected plumbing or electrical issues, or if you are not confident in your ability to service the skimmer properly.
It is a modest piece of pool care, but the skimmer is instrumental in supporting good circulation and a clean pool surface.