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Fax: 01333-353-493
Store Hours: By appointment only.
How Many Brushes
How Many Brushes

Calculating the number of brushes you require
Numbers will depend upon the design you choose.

See layouts for details and then look at quantity charts.

Rectangular chambers
4 inch (10cm)
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6 inch (15cm)
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8 inch (20cm)
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Circular chambers
4 inch (10cm)
VIEW view
6 inch (15cm)
VIEW view
8 inch (20cm)
VIEW view
In circular chambers, brushes should be arranged so that there are as few gaps as possible round the edges. Alternatively you could use Black Knight vortex brushes

Before purchasing Black Knight brushes, you should decide what type of filter design will be best for your pond.

How to use Black Knight Filter Brushes

If you have a small pond with a few goldfish and a couple of koi then a single chamber with three to six lines of brushes will be ideal. For a more demanding situation, it will be necessary to use a much larger chamber or to link two or three together. These can all contain brushes or you can use them in the first and second chambers and then use a stone medium such as Lytag, Canterbury Spar or Alfagrog in the last chamber.

Recommended spacing

The distance between the brushes should be as close to the recommended spacing as possible but the width of the chamber should be divided by the number of brushes required to give the spacing (see How Many). For instance, a 31 1/4 inch (79.5cm) wide chamber would be divided by ten when using 4 inch (10cm) brushes, to give a spacing of 3 1/8 inch (8cm) between the brushes