At Koi Water Garden, we are able to offer competitive prices on not only high quality koi, but also on koi related goods such as complete pond filter systems, Vortexes and filter media. Here you will find the widest range of filter systems available today, and all at competitive prices!

last updated 15th May 2009

Contact us

The Old Rectory, Risborough Rd
Gt Kimble, Nr Aylesbury
Bucks   HP17 0XS
Phone/Fax 01844 342390

Shop online with confidence via our secure on-line shop. We  accept all major credit cards! - see What's new for details.

Professional Filter range

Vortexes

Trickle Towers

Prefilters

Filter Media

Nexus filters

Bead Filters

Please note that carriage charges shown for individual filters apply to deliveries to England, Wales and parts of Scotland.  For deliveries to Scottish Highlands, Ireland  and Islands please see our dry goods delivery charges page or contact us for a carriage quotation.

How to choose the right filter

Ring or email for package prices.

KF5000 (4 Bay) 51” x 17” x 19” Deep
Maximum flow rate 3,000 litre per hour
Inlet size 3” - Outlet 2” solvent

Can also be used as a pump fed filter by reducing inlet
Three drainage points - (Accepts 1.5" solvent weld pipe for remote drainage)

This unit is without doubt one of the best selling and real value for money filter systems on the market today!

Delivery costs From £12.50 - please contact us for exact delivery quote

The KF10000 is a high quality, free-standing, fibreglass, four bay, filter with integral vortex. Its multi chamber design ensures maximum filtration with the minimum of maintenance. The unit is suitable for fish ponds of up to 10,000 litres and a maximum flow rate of 6,000 litres ph. However, with lighter stocking densities the KF10000 will comfortably cope with larger volumes. The integral Vortex enhances the unit's performance and reduces the maintenance intervals

Bay 1              Eight 16" long x 8" diameter polypropylene filter brushes.  
Bay 2              Blue matting - This is an excellent filter media as it has excellent bio-mass retention and its open texture removes larger particles from the water. 
Bay 3              Six layers of sponge with varying layers of porosity, two large foam blocks and a layer of Flocor. 
Bay 4              Filled with Flocor.

Delivery costs from £29.50 - please contact us for exact delivery quote

The pump fed model has a 4" inlet and outlet while the gravity fed model has a 4" inlet and 1.5" outlet.

Dimensions.  81” long x 21” wide x 24” Deep. Maximum flow rate 6,000 litre per hour. Three drainage points - (Accepts 1.5" solvent weld pipe for remote drainage). Supplied with 3 1.5"  Ball Valves.

The KF18000 is the largest integrated model in the range. It is a large high quality, free-standing, fibreglass, four bay, filter with integral vortex. Its multi chamber design ensures maximum filtration with the minimum of maintenance. The unit is suitable for fish ponds of up to 18,000 litres and a maximum flow rate of 11,000 litres ph. However, with lighter stocking densities the KF18000 will comfortably cope with larger volumes. The integral Vortex enhances the unit's performance and reduces the maintenance intervals

Bay 1              Eighteen 16" long x 8" diameter polypropylene filter brushes.  
Bay 2              Blue matting - This is an excellent filter media as it has excellent bio-mass retention and its open texture removes larger particles from the water. 
Bay 3              Three layers of reticulated foam with different densities.  These sit on top of a layer of approximately 2 cubic ft of Flocor.
Bay 4              Six way foam block manifold assembly on top of a layer of 6 cubic ft of Flocor.

Delivery costs from £39.50 - please contact us for exact delivery quote

The pump fed model has a 4" inlet and outlet while the gravity fed model has a 4" inlet and 1.5" outlet.

Dimensions.  102” long x 33” wide x 32” Deep. Maximum flow rate 11,000 litre per hour. Three drainage points - (Accepts 1.5" solvent weld pipe for remote drainage). Supplied with 3 1.5"  Ball Valves.

The Large module Filter system (shown right) is a very substantial fibreglass system  suitable for large ponds.  A four module system would be capable of excellent filtration in ponds of up to 10,000 gallons.  It is sold as separate modules for ease of transportation, and to allow the user to configure any shape and size of filter system.  We recommend the system is used in conjunction with a large Vortex (see below). The bertha units have two 110mm inlets, two 110mm outlets and two 1.5” drain outlets with valves and reducers. They come complete with grids and silicone for home assembly but do not include media. For ease of delivery and storage these units nest like supermarket baskets and are ready for assembly on site (approx. 15 minutes).

 Delivery costs dependent on number of modules selected and delivery postcode.

Each module s 35” x 40” x 36” high and comes complete with 2 drains, 2 grids, 2 ball valves, 1.5” and 4” tank connectors, bends, internal pipe work and a tube of silicone for home assembly (easy stack) making collection and transportation to site less drama

These modular filter systems are designed for the serious koi keeper,  being generously proportioned and built from multilayer fibreglass for maximum strength.  They are designed on the up and over principle, with transfer ports incorporated where appropriate for most efficient water flow. All models have steeply benched chambers with individual drains and are supplied with filter grids for each chamber. All are supplied with 4" inlet for connection to a suitable vortex or 4" bottom drain inlet pipe. We recommend the use of vortexes with all these filter systems.

These beautifully built units must rate amongst the strongest and most professionally finished on the UK market.  The comprehensive range allows the Koi keeper to choose the most appropriate model for the pond size in question.  Supplied complete with pipe work and valves installed and filter media support trays. With steeply benched base hoppers and made to be preceded by our Vortex range (see below). Lids available for all models. Systems can be doubled up and run in parallel for larger ponds. Supplied without media.

media can be supplied at an extra cost depending on personal choice.

Delivery costs on all models from £35.00. - please contact us for exact delivery quote

Above:- medium Pro 3 bay unit shown with media (not supplied)

Above:- Large Pro 4 bay unit shown.

The use of a Vortex on any filter system designed to be used with koi is, in our view, now absolutely essential.  A Vortex is without doubt, the best, most efficient and simplest mechanical filter device on the market - bar none!  Like all great inventions, the principle on which a Vortex works is very simple.  The water enters the unit from a tangentially positioned entry point which causes the water to spin very slowly. This causes all suspended solids in the water to be moved to the sides of the chamber via tangential forces.  When the solids hit the sides of the unit friction causes them to slow down and they drop out of suspension down the sides of the Vortex into a steeply sided cone or funnel where they collect.  A special bottom drain in the Vortex is controlled by a slide or ball valve and ALL the dirt can be removed by simply opening the valve for approximately 5 seconds.  No other cleaning is required!  With a correctly sized installation, over 80% of the solid waste entering a Vortex chamber can be removed before it passes through to the next chamber.

It is vital to size the Vortex correctly for your installation, and Vortexes are designed to be used with certain flow rates.  If the Vortex is too small, the water will spin too fast and some of the benefits will be lost. Please ASK us for our recommendation before ordering- we will be happy to specify the correct size unit for your system.

Small Vortex - Universal

Free standing small Vortex - Fibreglass with 1.5" drain, 4" inlet and 4" outlet which can be fitted in any position to suit the installation. Made for Pressure pipe fittings but can be used with solvent weld waste with appropriate pipe adaptors (not included)
Dia 61cm & H78cm

Delivery costs from £12.50 - please contact us for exact delivery quote

Medium Vortex - Universal

Free standing medium Vortex - Fibreglass with 2" drain, 4" inlet and 4" outlet which can be fitted in any position to suit the installation. Made for Pressure pipe fittings but can be used with solvent weld waste with appropriate pipe adaptors (not included)
Dia 70cm & H94cm.  

Delivery costs from £19.50 - please contact us for exact delivery quote
 

Large Vortex 

Free standing large Vortex - Fibreglass with 1.5" drain, 4" inlet and 4" outlet.. Made for solvent weld waste pipe fittings but can be used with pressure pipe with appropriate pipe adaptors (not included)
Dia 90cm & H120cm.

Delivery Cost from £29.50 - please contact us for exact delivery quote

Cetus Pond Sieve Prefilter

The New Cetus pond sieve is a very efficient mechanical filter which can be fitted directly to a bottom drain or to a skimmer. It can be pump or gravity fed and incorporates a patented floating weir system which regulates the water level in the unit, and ensures a constant and even curtain of water flow over the stainless steel filter screen regardless of pump size. Water is pumped from the base of the unit back to the pond (or to the next stage of your filter) and the unit features a drain valve to remove solids which collect in the debris trap. The stainless steel screen is 300 micron to ensure very fine solids can be removed, and owing to the curved 'ski slope' design of the screen, it cannot block.

Cetus are built in the same way, and from the same materials as the Nexus filter range, so they are remarkably strong, simple and yet very light.

Dimensions 95cm high, 85cm deep and 55cm wide

Cetus pond sieve shown in use and trapping solids

The principle or trickle tower filtration is well documented, and trickle towers are without doubt the most efficient conventional biological filters available today. Water is pumped up to the top of the chamber(s) where it is dispersed via a spray bar over a tray of media.  The water percolates through the given media and then trickles down to the next tray of media where the process is repeated until the water returns by gravity into the main filter system or pond.

Any good biological media can be used in trickle towers but favourites are the honeycomb media which we supply (see below) since it has a very large surface area, provides for excellent water flow and distribution and is very light.  Japanese matting is also recommended.  We are delighted to be able to offer two models to cater for all pond sizes and individual requirements. The large unit is designed to be used as a three of four tower system, and the smaller unit can be stacked and built up to 6 or more trays and tailored to specific needs using any chosen media.

Above - View of top tray showing spray bar and honeycomb media

Large trickle tower.

Our large Trickle towers are made from multilayer fibreglass and are very rugged. They are available as a standard 3 or 4 tray system - with or without media.  All are supplied with spray bar and 3" (82mm) return and filter media grid support trays.

Delivery costs from £39.50 for 3 tray system - please contact us for exact delivery quote
 

Above - Large 3 tray trickle tower system

Above - base unit empty

Small trickle tower system.

Above 3 tray trickle tower complete.

pictures left and right shows individual tray unit empty

Foam Fractionators or Protein Skimmers provides an excellent filtration aid to improving water quality and clarity by removing proteins and fine suspended solids from the pond water.  They achieve this by a process known as adsorption.

These units will appeal to those suffering from foam on the pond surface which is caused by proteins or dissolved organic compounds (DOC), or who have difficulty removing the very fine suspended solids found in pond water, especially during the warmer months. 

The basics of operation is that pumped water passes through a venturi unit, where air is drawn in to the water flow which creates a mass of air bubbles. Proteins and fine solids stick to the surface of these bubbles by a process known as adsorption. The bubbles burst within the central inner chamber of the tank (or reaction chamber) and the extracted contaminants along with the foam are passed by gravity along a pipe to the external waste trap. The remaining filtered and cleaned water is returned to the pond.

The difference in clarity achieved using a protein skimmer is absolutely amazing.  The water will lose that yellow or brownish tinge, caused by proteins, and much of the fine solids normally present in pond water will also be removed leaving the water sparkling and clear.

An added benefit of these units is that oxygen levels in the pond are raised because of the amount of air that is drawn into the unit,  much of which will be dissolved into the water flow returning to the pond.

Tornado Protein skimmer

Tornado

The Tornado utilises a Kaldnes type media to provide biological filtration in a similar way to a small trickle tower.

 Water enters the unit at the very top and is pumped via a venturi into the body where it trickles over the media. Foam and contaminants are passed down to the centre of the unit where they are separated from the cleaned water in a special reaction chamber. Foam and waste products then exit from the small waste outlet (shown on the lower left of the unit pictured). Cleaned water returns to the pond through the large 1.5" outlet on the lower right of the unit.

If required, the unit can be emptied for cleaning by removing the clip on lid assembly.  As the media and reaction chamber are self cleaning, maintenance of the unit is minimal.

Clarity Protein skimmers

Clarity protein skimmers were developed in Norway for both commercial fish farming operations and Koi ponds. They represent the latest technology in protein skimming as they work on a somewhat different principle to conventional skimmers. It has always been more difficult to get efficient protein removal from fresh water applications since bubble sizes produced with fresh water are large in comparison to salt water applications and therefore skimmers tend to be less efficient in fresh water.  Clarity has overcome this problem using patented design technology and these units work just as well with fresh water applications and are super efficient. So efficient are they that they not only remove DOC (Dissolved Organic Carbon), proteins and fine solids from the water, but they also lower Nitrate and Phosphate levels substantially, something which normally requires very special filter equipment.

However there is another huge difference between Clarity and other protein skimmers - they are not just protein skimmers, but Trickle towers and complete biological filters in their own right. The CL3 contains 50 litres of HSA type polypropylene media - as much as a Nexus 200! and the CL10 contains 100 litres of the same media - the same as a standard Nexus 300. In addition, because Clarity utilises this media in a Trickle tower configuration, it is biologically much more efficient than having the same amount of media in a conventional filter.  So with Clarity installed, there is no need for further or additional biological filtration. Therefore a Clarity systems can replace a conventional biological filter completely and will give far superior water quality.  Clarity represents one of the most amazing breakthroughs in filter technology in recent years.

Removal of nitrogen, nitrate and nitrite from a fish pond

 Above Clarity CL10 skimmer installed on a Nexus 300 filter system

Above a clarity CL3 unit after running for only 12 hours on one of our ponds! Just look at that foam! Amazing!

Treatment with Clarity™ gave approximately 40% reduction in total nitrogen, nitrite and nitrate in a 30 000L fish pond after just 9 days with recirculation every 5 hours.

Please note that the water source contained approximately 67kg live fish which were being fed 0.8kg food daily throughout the test.

Download brochure

Clarity units need no forced air input or venturis to create the foam, unlike other protein skimmers.  Apart from the fabulous efficiency, they only need low power pumps to run them so running costs are very low. The effectiveness of Clarity is shown clearly in the picture right.

Delivery costs From £9.50 - please contact us for exact delivery quote

Nylon brushes in a stainless steel wire. Still one of the cheapest and most effective mechanical filter medias available.  Simple to clean and will remove quite small solids and will prevent blanket weed and other detritus from passing through to the biological stages of your filter.

One of the best filter medias available, light, easy to clean, completely free flow and will not clog. Supplied as sheet approx. 35mm thick.

 Custom cartridge can be made to order - prices available on request

1m x 1m

Please note there will a delivery surcharge applied to orders containing more than 2 sheets of Japanese Matting regardless of order value - this charge will vary depending on the number of sheets ordered. We will confirm any surcharge with the order acknowledgement. It will not show in the shopping cart

Alphagrog

Excellent biological filtration media with huge surface area and comparatively light weight. Very economical media which matures quickly.

carriage £7.00 for up to 2 bags

Please note there will a delivery surcharge applied to orders containing Alphagrog - charge dependent on the number of bags ordered. Delivery on up to 30 kg (2 bags) would cost £7. We will confirm any surcharge with the order acknowledgement. It will not show in the shopping cart. This charge will be applied regardless of order value.

Bio Ceramic media

Excellent biological filtration media with absolutely massive surface area and comparatively light weight.  Matures quickly and super efficient. Fantastic value for money as up till recently ceramic media came only from Japan and cost the earth. Ideal for main filters and trickle towers

Crushed Oyster shell

Keep crushed oyster shell in your filters to help buffer pH and water hardness.  We can experience unacceptably low pH and KH (calcium hardness) values in pond water  because of the effects of acid rain and chemical additives in our water supply.  Oyster shell, a rich source of calcium will gradually dissolve in soft water and/or low pH conditions so buffering the water.

carriage £7.00 per 20kg bag

Ideal for holding media such as Alphagrog, Ceramics, or other loose fill material - makes it easy to remove and clean both the media and the filter chamber!

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