Simultaneously you carry out a partial water change.
The sera gravel washer round is especially suitable for larger areas.
Dimensions: height 25 cm (9.8 in.), Ø 5.7 cm (2.2 in.)
The sera gravel washer triangular is especially suitable for small aquariums. It makes cleaning in the corners and between the plants easier.
Dimensions: height 14 cm (5.5 in.), edge length 7 cm (2.8 in.)