Yes, and timing matters more than the method.
A floating leaf can be removed in seconds with a skimmer. That same leaf, once it’s sunk to the bottom, becomes a problem of an entirely different magnitude. That’s the difference between easy fall maintenance and a pool you can’t get balanced by October.
What Changes When a Leaf Sinks
A fresh leaf floats because it still contains air and very little water. After a few days in the water, it soaks up water, becomes heavier, and sinks to the bottom. From that point on, three things happen simultaneously: it decomposes, it releases pigments, and it ends up out of reach of the skimmer, which only works at the surface.
Our autumn motto: Pick them up while they’re still floating.
The four real problems leaves cause
1. They restrict water flow
This is the most immediate effect. Leaves accumulate in the skimmer basket, then in the pump’s strainer. The passage narrows, the pump continues to draw with the same force against increasing resistance, and flow drops throughout the entire system. The result: your filtration system runs, consumes power, and barely filters at all. A pump operating under these conditions also wears out faster than it should.
2. They stain the filter media
The leaves contain tannins. A leaf left at the bottom of a pool for several days releases these tannins directly onto the pool lining. On a light-colored liner, this leaves a brown mark that exactly matches the shape of the leaf. If caught early, these stains often come off by brushing and chemical treatment. If they’ve been there for weeks, they may remain visible long after the pool reopens.
3. They increase the demand for disinfectant
A decomposing leaf is organic matter, and your disinfectant targets organic matter. Every leaf rotting at the bottom therefore consumes a portion of the chlorine you’ve just added. This is why some pool owners find their water “soft” in the fall despite normal dosages: the product is present, but it’s busy working elsewhere.
4. They complicate the closing process
This is the most time-consuming problem—and the least obvious at first glance. You can’t properly close a pool whose water is heavily contaminated and out of balance. Whatever remains in the water at closing time stays there all winter, under the cover, without filtration or light. A dirty closed pool reopens dirty, and you’ll have to catch up in the spring [link to Closing Your Pool Yourself: The Seven Mistakes That Cost You in the Spring].
The Right Approach When You’re Surrounded by Trees
A wooded area completely changes the way you proceed. During the two or three weeks of heavy leaf fall, skimming the pool every other day is better than doing a big cleanup at the end of the week. It’s not more work overall—it’s the same amount of work, but spread out at the right times.
Three habits that make all the difference:
- Scoop the surface briefly with a net before the leaves sink.
- Empty both baskets—the skimmer basket and the pump basket. The second one is most often forgotten.
- Cover the pool on windy days, if you have a cover. Those are the days that fill up your pool the most.
“People make a point of raking leaves off their lawn, but they put off dealing with the ones in the pool. You should do the opposite. On the lawn, they can wait. In the water, they work against you every day.” — Tristan Dufour, owner, Piscine Évolution
What if the bottom is already covered?
Don’t brush first. Brushing stirs up the debris, and some of it gets swept back into an already clogged filtration system.
First, remove the debris at the bottom using a bottom net or a vacuum cleaner, working slowly so as not to stir up the material. Empty the baskets frequently during this process, as they will fill up faster than usual. Next, adjust the balance of n the water, then let it filter for a few extra days. The brushing step comes at the end, once the water has cleared up again.
Frequently Asked Questions
Can leaves really damage a liner? They don’t puncture it, but they can stain it. The tannins they release leave marks on light-colored liners, and a stain that’s been there for several weeks doesn’t always come out completely.
Should leaves be removed before closing the pond, even if it’s closing soon? Yes, and this is actually one of the times when it matters most. Anything left in the pond at closing time will remain there all winter without filtration.
Does a winter cover solve the problem? It prevents the problem from getting worse, but it doesn’t fix it. You should install a winter cover over a clean pond, never to cover debris that’s already there.
Is a robotic vacuum enough in the fall? Rarely, on its own. Most robots handle fine particles well but get stuck on whole leaves. When leaves are falling in full force, a skimmer remains the best tool.
What You Can Do This Weekend
Take out the skimmer for ten minutes, empty both baskets, and look at the bottom of your pond against the light. This is the best way to see what’s really down there. If your property is surrounded by trees and this chore comes up every week, that’s exactly the kind of situation our end-of-season maintenance service handles, right up until closure. You can also book a pre-closure cleanup on its own, before the buildup becomes a problem. Contact us for a quote.
