If you want a beautiful, clean pond that it is a pleasure to look at then you need to choose the right filter for your pump.

This might seem like a relatively minor issue at first but if you get it wrong then your pond could fairly quickly begin to look dirty and clogged. Of course, this is an even more important issue if you are going to have fish in it or hope to attract wildlife to use it.

Therefore, you will want to learn about how to choose a good filter that does exactly what you need it to do. 

Best Pond Filters 2020

Oase BioSmart 14000 Set

This is a comprehensive biological filter that has an impressive set of cleaning and filtration features for cleaner, healthier water. The fact that it is powered by a hefty 70 Watts motor means that the Oase BioSmart 14000 can handle ponds with up to 14,000 litres in them.

This is a relatively expensive purchase, as the set comes complete with the matching pump. However, it is a terrific set that you can quickly set up and then let get on with the job of keeping your pond in perfect condition.


  • Easy to set up
  • Suits a big pond
  • Comes complete with powerful pump

Hozelock Ecocel 2500 Pond Filter 3921

This filter comes from a well-respected manufacturer and promises both mechanical and biological filtration for a clear and healthy pond. It works through water going in through a special head and then over a foam sheet and plastic bio-media.

The Hozelock Ecocel 2500 is a stand-alone system, with means that you need to get a pump for it as well. This keeps the price down and makes it ideal if you already own a pump or want to choose one separately.


  • Thorough filtration system
  • Good value


Jebao Filter and UV Clarifier Combo for ponds up to 6000L #UBF-6000

The Jebao Filter and UV Clarifier Combo works on ponds that contain up to 6,000 litres of water in them. It has both a biological filter and a mechanical filter as well as a UV clarifier, giving you a comprehensive way of keeping the pond clean.

The manufacturer’s good reputation makes this a sound purchase. If your pond fits in with the stated capacity that it can handle then this filter is an easy choice for a simple life.


  • Comprehensive filtration package
  • Powerful enough for a big pond

Blagdon Midi-Pond Filter for 25,000L

The Blagdon Midi-Pond Filter is suitable for ponds with a maximum of 25,000 litres. It comes from a firm that has a long history in gardening and fish maintenance products.

In this case, the filter combines a solid waste filter with a UV clarifier. In addition, a Venturi Aeration Chamber is used to aerate the water to give the fish living in it better water quality.


  • Comprehensive filtration package
  • Good value
  • Reputable manufacturer

How a Garden Pond Filter Works

We can get started by looking at how pond filters work. Basically, this sort of filter is designed to reduce the amount of potentially harmful bacteria that is floating around in the water.

In fact, it is important to point out early on that there are actually some different types of pond filter in use. Typically, all of the different types of function are now carried out in one device. However, this isn’t always the case and it is still good to understand the differences between different pond filtration systems.

First of all, a UV pond filter also know as a UV clarifier will kill off the green water, which will keep the pond nice and clear. Yet, this function isn’t enough on its own, as it won’t filter the dirt and rubbish from the pool.

This function is carried out by a biological filter. It is this element that keeps the water clean and healthy for your fish by introducing friendly bacteria that work to break down the bacteria in the water.

In some cases there is also a physical filter that acts as a barrier and picks up pieces of dirt. This needs to be changed or cleaned regularly to keep it working well and being effective.

Why You Need a Pond Filter

If you have fish in your pond then you will definitely want a filter, as this will give them a healthy place in which to swim and to live. It is also going to make the pond more attractive for other types of wildlife – such as birds and nocturnal creatures – to use.

If you aren’t going to put fish into the pond then you might simply want to use a filter to keep the water crystal clean and free of nasty bacteria. Of course, families with children might also worry about what would happen if the little ones spend time messing around in an unhealthy pond with no filter.

Those pond owners who decide to opt to not get a filter can look to maintain a natural balance in the water instead. This will do the same sort of job in keeping the water clear and healthy but it can take time to get a balanced nitrogen cycle in place.

Those who decide to go without a filter will need to have plants covering about two thirds of the water, to clear up the toxins. You should be able to introduce fish about a year and a half after starting up this type of balanced pool.

On the other hand, a biological filter will take up to around 6 weeks to have enough helpful bacteria to do its job.

How to Choose a Pond Filter

There are a few different factors to take into account when choosing the right filter for your pond. The starting point has to be with the capacity that you need, bearing in mind the volume of water and the number of fish in the water or whether you need a koi pond filter.

You will also have more need of a bigger capacity if your pond gets a lot of sunlight on it and has few plants in it. There is no risk of over-filtering with the biological filter, so it is better to be safe than sorry if you have a lot of fish that you want to look after as well as possible.

Most modern pond filters are very easy to set up, so you should look for one that you can have up and running without any hassle at all.

You might also interested in Feature pond pump reviews. Visit our page for Feature pond pump reviews here.