Skimming & Debris /
Why Leaves Sink Before the Skimmer Reaches Them
Leaves often sink when they get waterlogged or the pool’s surface flow is too weak. Safe checks can reveal whether the skimmer, pump, or circulation needs attention.
Archive date: this article was written for PoolSkimmer on Oct 7, 2026 and given the earlier archive date of Aug 27, 2026 so the blog reads as an organized archive. It was not published on that date.
The reason leaves sink
It is not uncommon for the skimmer to miss a leaf. They do not remain on the surface long enough in some cases. After taking on water, a leaf becomes too heavy and will make its way to the pool floor before it can be pulled in. The same goes for fine organic matter, bug debris or pollen, particularly in the wake of hard winds or rain.
Typical culprits are:
- Leaves that have become waterlogged
- Insufficient suction from a dirty filter or clogged skimmer basket
- A skimmer weir door that is stuck and won’t allow for proper intake
- Return jets that are directing debris away from the skimmer
- Water levels outside the normal range
- Lax water flow at the surface
Where to begin
The first order of business is to run through the basic maintenance checks and observe the movement of debris on the water. Should you see leaves heading for one spot and vanishing, you are likely looking at a circulation issue as much as a problem with the leaves.
Proceed with these safe steps:
1. Shut the pump down prior to opening the skimmer basket. 2. Clear out any debris from the basket and the skimmer opening. 3. Make sure the water level is where it should be. 4. See if the weir door has free movement. 5. Examine the return jets for a good circular flow. 6. If skimming is slow, have a look at the filter for any buildup.
Use appropriate PPE and read your chemical labels; never put a hand into suction equipment while it is running. And always refer to the manual for your equipment.
Maintaining a cleaner pool
There is value in regular skimming to keep the filtration system and baskets from clogging. It is best to get after the surface soon after a storm or a blustery day, before organic debris has time to waterlog.
Good practice is to skim frequently when there are lots of leaves, and to empty the baskets before they are full. Brush the plaster and corners where leaves have a tendency to gather, and vacuum anything that has settled to avoid staining. Do not let return jets push what you are trying to catch away from the skimmer.
While a robotic or manual vacuum is a useful tool, it does not take the place of skimming, which is the primary defence against surface debris.
Pitfalls to steer clear of
Do not assume the filter will handle everything, or that the pump is fine just because it is still running with a clogged basket. A stuck weir door should not be left alone. Nor should one reach into the skimmer with the equipment on.
And resist the urge to pour in chemicals simply because the water is dull. Algae or an odor may point to a water quality problem that requires a proper diagnosis.
Time to bring in a pro
If you have cleaned the basket and checked the return flow but leaves are still sinking with haste, it is worth calling a qualified professional. The same applies if the pump is making noise, losing prime or shutting off on its own.
For broken parts on the skimmer, electrical problems, or persistent cloudiness and stains, seek expert help right away. Under no circumstances should one swim if the bottom of the pool is not visible or if there are any electrical concerns.
In short
More often than not, leaves sink because they waterlog quicker than the skimmer can deal with them. Keep the baskets clean and the circulation up for better results. But if the issue is stubborn, let a professional have a safe look at the pump, suction and overall flow.