If you have your own pond, then water quality issues are not to be overlooked. Hazy water, unpleasant odors, and stressed fish always seem to indicate one problem: poor circulation and filtration. Many novice aquarists soon face one of the more confusing dilemmas: what exactly is the difference between a skimmer and a filter in a pond? Though they may resemble each other in pictures, they actually perform vastly different roles. Here we will discuss each of them and what they actually do.
What Is a Pond Skimmer and What Is Its Function?
A pond skimmer works from the surface of the water. Its purpose is not to clean the water in a chemical sense. It removes unwanted materials before a problem exists.
Leaves, floating grass, flower petals, and insects tend to drop into the pond. Initially, the objects float. After a day or two, the objects begin to sink. Once the objects have sunk to the bottom, decomposition begins to form sludge.
This chain reaction is prevented by a skimmer.
Generally, skimmers are located along the edge of a pond. The water pulls floating objects into a basket or net. The clean water continues through to the pump. The objects in the net need to be removed by hand, once a week.
Skimmers are especially useful if your pond is located underneath a tree or in a heavily planted area. In a heavily planted area, it can become a real problem to clean up the material floating on your pond's surface. Without a skimmer, it will be in your pond's filtration system in short order.
An important point to keep in mind when it comes to a skimmer is that it doesn't deal with fish waste, algae spores, or dissolved nutrient particles. It just stops large particles from entering your pond system.
What Is a Pond Filter and How Is It Different?
A pond filter actually works on the water as a whole, as opposed to just the top layer of the pond.
Whereas skimmers concentrate on preventive measures, filters concentrate on treatment. They clean water that is already present within the pond.
Three processes are carried out by most pond filters:
- Mechanical filtration (traps small particles like fish waste)
- Biological filtration (supporting beneficial bacteria for the decomposition of ammonia and nitrites)
- Optional chemical filtration (for removal of odors or colors)
This is what makes a pond filter and a skimmer different. A skimmer prevents waste from entering. A filter makes water safe even if waste has already accumulated.
For instance, the 20W Solar Pond Filter Fountain is a solar-powered pump that filters pond water by drawing it through different materials before spraying it back out as a fountain.
Filters are also important if there is any fish life in the pond. Fish constantly produce waste. If there is no filter, poisonous ammonia rapidly accumulates. This is true even if the pond is very small.
In short:
- Skimmers control what gets into the pond
- Filters are responsible for controlling what happens inside the pond
They solve different problems.
Pond Skimmer vs Filter: How to Make a Choice Based on Real Conditions
When selecting the best pond filter system, it's not so much a matter of theory as it is a matter of your specific situation.
Size and Depth of the Pond
Smaller decorative ponds might operate with just a filter. Larger ponds might need both for stable conditions.
Fish Population
No fish? You might get by with little filtration. But with fish, a filter is a necessity. A skimmer is just a convenience.
Surrounding Environment
Trees have leaves, gardens have petals, and wind causes debris. Any of these scenarios will require a skimmer to avoid future clean-up.
Power Preference
Some may prefer solar equipment due to the savings it entails. Others may wish to have the reliability provided by AC-powered equipment.
For more flowing water and deeper ponds, the 70W Solar Pond Filter Fountain provides more water volume while maintaining energy efficiency.
For ponds that require continuous operation during both day and night hours, there is also the 40W AC Pond Filter Fountain with Light.
In most real-world ponds, it's not really a choice between a pond skimmer and a filter per se; it's how they complement each other to reduce maintenance and increase overall water stability.
Conclusion
It is very important to understand that the purpose of a pond skimmer is totally different from that of a pond filter. The purpose of a pond skimmer is to remove any unwanted material that has not yet sunk to the bottom. The purpose of a pond filter is to keep the water clean, and hence healthy for the fish.
When you are new to ponds, start with a filter appropriate to your pond and fish population, and consider adding a skimmer if you have trouble with surface waste. Many people find that running both is worth the investment, as it leads to much clearer water and far less maintenance in the future.
If you want to see how this works in the real world, you can read: My Journey of Installing and Using Poposoap Solar Pond Filter.
A well-balanced system will always be superior to a quick fix.
40W 480GPH Solar Pond Filter Fountain
$143.99
Solar pond pump and filter kits with 40W panel and 480GPH pump, filter box, nozzle + diverter valve, filter mats and biospheres. Solar powered fish pond filter.
FAQ
Do I Need Both a Pond Skimmer and a Filter?
Not always, but ponds with fish or debris falling into them can benefit from using both.
Can a Skimmer Replace a Pond Filter?
No. A skimmer removes debris but does not chemically and biologically treat water.
What Type of Pond Filter Should a Beginner Use?
Fountains with all-in-one filter systems are generally the simplest to maintain.
How Frequently Should I Clean My Skimmer or Filter?
Skimmers may need to be checked once a week. Filter requirements vary depending on the fish load and the amount of debris.
