We are in the business of selling pond filters, however, not all ponds need a filter system! We always start by explaining to customers how to achieve natural balance in your garden pond without the aid of a filter system. Having said that, if you decide to go down the route of filtering your pond you will be faced with choices....

Which is the best filter for your pond? Our answer is always the same....the best filter is the biggest one you can put up with! The bigger the filter, the more muck it holds and the less you need to clean it out. The less you clean it out, the more the biological side of filtration takes place. Every time you clean your filter, you kill some of the bug-life and ‘good bacteria’ which is helping to break down the fish waste. Also, cleaning out your filter is not a job you would choose to be doing every weekend! You will need to turn over the volume of your pond through your filter every hour on a smaller pond, every hour and a half to two hours on larger ponds. Your filter will need to be big enough to accommodate such a flow. We are always happy to work out the volume of your pond, give you a choice of filters and help you to make an informed decision.

Gravity-outlet box filters. The original (and some might say, still the best!) low-maintenance filter which relies on the natural, biological breakdown of fish waste. The water will be pumped in to the filter box where layers of foam will settle-out and collect large, medium and smaller particles. The finer, flossy wadding underneath will collect any small particles which have managed to pass through the foam layers. Any particles that make it through the flossy material (fine silt) are held on to by the media at the bottom of the box. The water will then return to the pond under gravity, therefore the filter will have to be sited with it’s outlets slightly higher than the pond....there is no going up-hill under gravity!

Pressurised filters. There are situations where a gravity-outlet filter box is not an option, which is where the pressurised filter comes in to play. Pressurised filters are generally smaller and easier to hide. They are a sealed cannister (no gravity involved), can be sited at a lower level and even part-buried. Because they are smaller, however, they don’t hold as much muck and require cleaning out a bit more often. Because they need cleaning out more often, manufacturers have come up with ingenious ways of making the cleaning process easier....back-flushes, stirring handles and handles that physically squeeze out the foams without getting your hands dirty!

UVs. A filter system is made up of three elements...a solids-handling pump to pump the dirty water, a filter to sieve out the particles and a UV (or ultra-violet light) to clear the green water. Most modern filters come with a built-in UV....separate, in-line UVs are also available. In the world of pond filtration, the UV is the best invention since sliced bread as it’s the element that keeps the water clear! The volume of your pond needs to pass through the UV every hour on a small pond, every hour and a half to two hours on larger ponds otherwise the water can go green quicker than the UV can clear it!

All-in-one filter,UV & pump. The easy solution to green water in small garden ponds. No need for a separate pump and external filter. Simply place the pump in the pond and connect to a power source. The UV in the fountain stem will help with your green water problems.



Claremont Aquatic Nurseries are specialists in ponds, liners, pond pumps, filters, aquatic plants and fish, and are located in Leyland, Lancashire



Claremont Aquatic Nurseries
Cocker Bar Road
PR26 7TA

Tel: 01772 421 860