... ,Color;. white& balck ,or as u need 2.K3,K1 is self cleaning and very efficient as a bio ... or other forms of static filtration media, the Kaldnes K3 media is designed to move freely within your filter. The ... of food per day. For retrofit of existing filters, K3 media is the most suitable due to its larger ... a bio media. However it is larger than K1, K3 has a multi layer and multi spoke construction and ...