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I want to put in a pond. How do I know what type of filter system I need? | Decorative Ponds & Water Gardens Q & A


Q: I want to put in a pond. How do I know what type of filter system I need?

Q: I want to put in a pond. How do I know what type of filter system I need?

Barb – Denton, NE

A: Choosing the right filter for your water feature can be a daunting task – particularly if you are new to the pond-keeping hobby. With all the designs and functions available out there, where do you start?

Your first step is to consider your pond’s location and its use. As you’re in the pre-planning stages, where do you plan on putting it, and what will you use it for? Will your pond be situated in full sun, or will it be shaded by a tree that drops leaves every fall? Will you have a small pond with a few small goldfish or a larger pond teeming with koi?

Once you’ve come up with a place and a plan, then you can start narrowing down the type of filtration system (or systems) that will work best for your pond.

External Pressurized Filter
Perfect for: Ponds in full sun
External pressurized filters are designed for small- to medium-sized ponds that are in full sun. Because all that sunshine encourages algae blooms and green water, these filters include biological, mechanical and ultraviolet filtration – a three-pronged attack that will keep your water crystal clear. Some also include a backflush option, which makes it easy to clean without having to remove your filter media. It’s one of the easiest filters to add to an existing pond because the plumbing doesn’t need to be run through the liner.

Waterfall Filters
Perfect for: Large ponds with many fish 
Designed for small, medium or large ponds, waterfall filters provide a big waterfall display while biologically filtering the water. The pond water flows up through the filter media, where the beneficial bacteria clean the water, then spills out to create an elegant water display. They’re great for new ponds and easy to install in existing ponds and water gardens. They don’t offer the UV filtration, but they typically filter more water, handle larger pumps and won’t plug up as easily.

Pond Skimmers
Perfect for: Ponds that get a lot of leaves
Providing mechanical filtration, pond skimmers do an excellent job filtering ponds that receive a lot of leaves and floating debris. They contain a filter mat and debris net to catch leaves before they settle on the bottom of your pond, and they house your pump, giving you easy access to it for upkeep and maintenance. Because pond skimmers only provide mechanical filtration, be sure to pair it up with a waterfall filter.

Submersible In-Pond Filters
Perfect for: Small ponds with a few small fish
These all-in-one submersible in-pond filters are one of the easiest systems to add to an existing pond, as all the plumbing is conveniently contained right in the unit. Ideal for small ponds (up to 1,200 gallons) with just a few fish, these filtration systems can be combined with a fountain or used with a small waterfall. They provide mechanical and biological filtration and include a powerful UV clarifier to eliminate discolored water.

Whichever filtration system you choose, make sure it’s sized right for your pond – you don’t want to under-filter your new water feature! If you have questions about filter types and sizes, just talk to one of our experts. We’re happy to help!

Pond Talk: What advice about filtration systems would you give to this new pond owner?

Make Pond Water Crystal Clear - The Pond Guy® ClearSolution™

One Response

  1. External pressure filters have drawbacks in my opinion. First, UV will destroy not only algae but also beneficial organisms and bacteria that help your pond function as an ecosystem. Next, back flushing can make a mess as it sprays out debris under pressure. Be sure you have an area open for this.

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