Mechanical, biological and UV clarifiers are the main types of filtration media available on the market. Here’s what they all are. Mechanical filters The hinged lid on the filter box makes it easy to open to clean the filters, this is something I have found to be not that simple with some filters I have used in the past. I like the safety feature of the micro switch that turns off the UV light if the lid is opened or removed, even if the power is still on. This prevents anyone from looking directly into the UV light and harming their eyes.

The EasyClear 3000 and 4500 have a maximum flow rate of 1260 lph and include a fountainhead to produce a fountain. Suitable for ponds between 3000-4500 litres in size or fish ponds between 1500-3000 litres in size, they’re the ideal pond pump and filter combination for a small pond. For a great price, you get three great features - a pump, a filter, and a fountain. The high performance pump is super efficient and has designed to last for years to come. It can be used to create a decorative fountain or waterfall in the pond. The Blagdon 9W 12000L Minipond 6-Stage Box Filter is the most sophisticated pond filter in this review when it comes to the filter system itself. It’s a gravity filter system so the box must be placed higher than the level of the water as it uses gravity to return the clean water to the pond. It’s a simple but effective system that works. It is also a great choice if you want to reduce maintenance and cleaning as it will last around 4 weeks between cleaning. The pump has a 2,300L flow rate and you know that it works perfectly with the other two pond cleaning appliances. The UV clarifier is a must and this one comes with a 9W bulb. All three pond cleaning units are designed for small ponds, that’s those up to 6,000L with no fish but the unit will be suitable for smaller ponds with fish. ( See the Buyer’s Guide for an explanation of how this volume changes with fish or sun). The filter box has both mechanical and biological filters in it. The mechanical filters are Japanese matting and has both coarse and fine grade filters, while the biological filter is bio balls. It is all pretty standard stuff but good enough to get your water filtered and clean.You know when it’s time to clean the filters as there’s a float mechanism that raises up when the filters are dirty. And the cleaning task is easy as you just turn a handle on the top of the box. This lets water in to rinse the sponges inside; you don’t have to open the box to do the cleaning. However, some online reviewers report that this cleaning operation has been hit or miss for them. The dirty water from this process exits the filter via a separate outlet to the clean water. Pros To apply for online finance, you must be over the age of 18, work at least 16 hours a week, or be retired with an income. You must also be a resident of the United Kingdom and have lived in the UK for the last 12 months or more. Credit scoring is the process used by financial services companies to evaluate the credit risk of new applicants. This technique will be applied to your application for online finance. Credit scoring works by awarding points for each answer given on the application form such as age, income and occupation, together with information obtained from credit reference agencies. The AllPondSolutions Pressurised Koi Fish Pond Filter with UV Steriliser is for garden ponds with water volumes up to 5,000L and it’s a good alternative to the AllPondSolutions Pressurised Koi Fish Pond Filter with UV Steriliser. Don’t go away if that’s not the size of your pond because this is just one in a whole range of sizes. This model is so available for ponds up to 3,000L; ponds up to 6,000L; and ponds up to 8,000L. Some pond filters come with a built-in pond clarifier. This is a UV light that kills the green algae in the water. The algae then drop down to the bottom of the pond and remain in the water and are caught by the filters as waste the next time through the filtration system.

As a pressurised pond filter, this AllPond Solutions model can handle more water than more conventional gravity-fed filters. It sits on the side of your pond where the filters work alongside the UV steriliser/clarifier to clean your pond water. The key to successful biological filtering is to allow the beneficial bacteria to grow upon the bio-balls or K2 media that’s in your filter. You need as many of these good bacteria as possible so look for filters that have a large surface area of biological filter media for the bacteria to grow on. This is a pressurised pond filter in a canister-shaped receptacle. This means that you can install it either above or below ground, which is one of the main advantages because it makes it easier to hide. It uses foam filters for mechanical filtration and a SUPRA+ bio media to encourage good bacteria to grow for biological filtration, something which is a must for healthy water. The single clamp on the lid lets you remove it for easy access to the filters for replacing them.

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Measuring at 310 x 280 x 313 millimeters, the compact dimensions of this water pump make it suitable for different installation spaces. The weight of 3800 grams adds to its portability and convenience.

The EasyClear 6000, 7500 and 9000 have a maximum flow rate of 1700lph and 2850lph. Suitable for ponds between 6000-9000 litres in size or fish ponds between 3000-4000 litres in size, they can run a fountain and waterfall simultaneously. In addition, the larger 6000, 7500 and 9000 models boast another feature. As well as the fountainhead, these units have a waterfall/watercourse outlet (if using both waterfall and fountain outlets, the flow will be split). The attractive water feature oxygenates your pond water as it passes through the system, causing suspended algae particles which cause green water to clump together so that the foam filter can trap them. For example, the Blagdon model in this article does clean a 12,000L pond but one that has no fish, is in shade, and is deeper than 75cm. Just add some fish and the volume of water that can be cleaned goes down to 6,000L. Working out the correct size Excluding postcodes below inScottish Highlands and islands, Isle of Man, Channel Islands and Isle of Scilly: (Currently we do not deliver to Northern Ireland) Something else I like about a lot of these pond filters is that most (not all) now come with a UV clarifier, as shown in the picture above, which helps prevent and remove green water caused by algae. Something that is probably one of the most common issues I see in ponds. Now, I’ve discussed UV clarifiers here where I talk about why I sometimes recommend having separate UV clarifiers. You can use a more powerful model as the ones built into the filter are sometimes a little underpowered, that being said, most are generally good enough.

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Basically, the size of the pond most filters are recommended for can be as much as half if you have fish and your pond is in the sun. So, a filter of 12,000 litres might only really be suitable for a 6000 litre pond if it has a lot of fish and is in the sun. They also sell smaller and larger models, so you will be able to select the right model that will be better for your pond. Each pond pump and filter combination boasts a powerful integrated pump that pumps water around your pond increasing oxygen levels. A UV bulb eradicates problem algae and clumps it together ready for removal, removing problem green water. As the dirty water flows into the filtration system, it first encounters the coarse pads that take out the bigger sediments and stuff, and then the fine pads that take out the smaller bits. This pond filter unit is compact and discrete and won’t stand out if you situate it on the pond floor. The depth of the pond, whether it sits in sunlight or shade, and the number of fish you have in there all affect the production of green algae and waste which the filtration system is set to clean. The shallower the pond and the more sun and fish, the smaller the volume of water and hence the size of the pond that any given model can handle.

A pond filter box is a necessity no matter how small or large your garden pond is. Sunlight encourages green algae to grow, fish always produce waste, and who knows what garden matter and debris will find its way into the pond. Keeping your pond water clear and sparkling enhances your enjoyment of the pond and creates an enticing habitat for all manner of wildlife.

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The EasyClear is suitable for ponds up to 4000 litres depending on model and environmental conditions.