Coarse Filter Sponge
Filter sponge to cut to the size you need.
Measurement: 50 cm wide x 50 cm high x 5 cm high
Available in black and blue.
The bacteria that effectively clean the water live on these filter sponges. It is recommended to carefully clean such sponges with hot water every 3 to 6 months or replace them. Always change only one of the sponges so as not to endanger the biological balance.