Alfagrog is a Volcanic rock and has been used now for several years with a great deal of success .. it is very inert and soon colonises with beneficial bacteria ...

Its only draw back - sharp on the hands when cleaning be sure to wear gloves

The Bacteria house is a ceramic that has been heat treated at 1300°c for 60hrs. This tremendous amount of heat causes the ceramic to break its internal bonds thereby creating an extremely porous structure that has a much greater surface to allow very large bacteria populations to colonise.

Due to the large quantities of tiny holes, mechanical filtration is also achieved. Large organic solids and decaying matter are degraded at a far greater speed than conventional media.

See Bakki Showers

Black Knight filter brushes are made from the very highest quality Hydrotek polypropylene twisted into two stainless steel wires to form a cylindrical brush with a loop at one end for hanging. The other end is capped with a plastic knob for safety.

Pictured to the right are both the filter brush and spawning brush.
 
They last indefinitely and are the easiest to use, most efficient and most cost-effective pond filter medium you can buy.

Spawning Brush If you have never bred fish before, you will be amazed how simple it can be with the help of Black Knight spawning brushes.

Highly efficient anti-clogging Flocor Bio-Media

Flocor is probably the most widely used of all the filtration media's because of it's simplicity to install - clean and maintain.

Great surface area makes for excellent filtration.

Probably one of the best of all the filtration media which is available today.

Extremely inert - and easy to service. It is available in sheet form and can be cut to the desired sizes to fit your filter chamber by using an ordinary Circular Saw

• The best biological medium available.
• Very firm and rigid.
• Never need to replace.
• Sinking.
• Dimensions 80" x 40" x 1.45"

Ready packed Zeolite in a handy net filter media bag, allowing Zeolite chunks to be placed in filter or water flow. Can be easily removed for recharging to remove ammonia from ponds.

5 Kg treats 6750 litres (1500 gallons)

Oyster Shells have been used for years Koi professionals to help with the pH of the water and to maintain optimal water conditions.

Since the Oyster Shells will generally raise the pH level in your water, these should only be used in cases of low pH.