![brush 12](https://www.blackknight.co.uk/wp-content/uploads/2023/10/brush_12.jpg)
![Brush Image](https://www.blackknight.co.uk/wp-content/uploads/2023/10/content_list_image_3.jpg)
How many?
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) – VIEW
6 inch (15cm) – VIEW
8 inch (20cm) – VIEW
Circular chambers
4 inch (10cm) – VIEW
6 inch (15cm) – VIEW
8 inch (20cm) – 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