3 profiled reticulated foam sheets:
1 x Coarse
1 x Medium
1 x Fine
Your sponge filter media inside your pond filter will deteriorate over time - this is natural as the filter sponges get clogged with dirt and debris.
You can wash out your existing sponge filters with pond water but over time the sponge will degrade and it will be time to employ new filters such as these.
Suitable for use with all compatible filtration systems. Simply cut down to size to fit your box filter. Colour - green, blue and black