6 Inch Filter Brushes in Circular Chambers – 5 Inch Spacing Guide
How Many 6 Inch Brushes Do I Need for a Circular Chamber?
6 inch (15cm) diameter Black Knight filter brushes can be used effectively in circular filter chambers when placed at the correct spacing. Their larger diameter compared to 4 inch brushes means fewer are needed to fill a given chamber, though careful attention to spacing is important to ensure good coverage and avoid unnecessary gaps.
Recommended Spacing for 6 Inch Brushes in Circular Chambers
For circular chambers, we recommend placing 6 inch brushes at 5 inch (12.5cm) intervals. This spacing allows the brushes to sit close enough together to interlock effectively while still permitting the correct flow of water through the filter medium.
6 inch (15cm) brushes placed at 5 inch (12.5cm) intervals. This example shows an 18 inch (45 cm) chamber.
How Many Brushes Will I Need?
The diagram above shows how 6 inch brushes fit into an 18 inch (45cm) circular chamber. Use this as a reference point when planning your own installation. For larger chambers, scale up using the same spacing principle, or get in touch for tailored advice.
Things to Consider
While 6 inch brushes work well in circular chambers of a suitable size, very large circular chambers may benefit from a mix of brush sizes to avoid gaps around the edges. Note that 8 inch brushes are not recommended for circular chambers as they leave significant gaps that reduce filtration efficiency — see our page on why 8 inch brushes don’t suit circular chambers for more detail.
If your chamber is rectangular rather than circular, see our guide to 6 inch brushes in rectangular chambers. For smaller circular chambers, 4 inch brushes may be a better fit.