Pond Filtration – How much do you need of what kind?

Figuring out what kind of pond filter you need can sometimes be a little overwhelming. There are so many different filters that claim to do so many different things, so how do you know which one is right for what you need?

Filters can be broken down into three main categories – mechanical filtration, biological filtration and UV clarification. Mechanical filtration easily removes any large particles in your water, while biological filtration breaks down organic material that may be in your water. UV Clarification sterilizes algae, and causes small particles to clump together which makes it easier for a mechanical filter to remove the particles. The best filters that you can get have all three types of this filtration in them.

Pumps can also be classified by how they are used and installed. For example, a pre-filter is usually something that is attached to a pump, and filters the water so that it doesn’t clog the pump. They do not remove waste from the water, and usually are only mechanical filtration.

The submersible filter is a pump that can sit in the water of your pond. If you decide to use this type of pump, you need to remember to keep it somewhere accessible for you so you can clean it occasionally.

An in-line filter is one that is pressurized. This filter is typically installed outside of your pond, near the pump out-take. This filter should not be installed inside your pond, especially if there is a UV light included in it. Because this filter is pressurized, it can be used to feed water to a watercourse or directly back into your pond.

External filters are typically the largest ones you can get. Again, this is not something that is installed inside your pond. If your pond is larger than 1000 gallons, this is what is usually recommended. What’s really great about this kind of filter is that it is probably the easiest type to clean, as it’s the easiest to get to.

So what kind of filter is best for your pond?

If you have a small pond, you would probably be okay with just a pre-filter or a submersible filter. As soon as you start adding plants, fish or more volume, however, you’re going to want a larger filter, preferably with all three types of filtration (mechanical filtration, biological filtration and UV clarification).