Yes. The 1st stage sediment filter must be a 5 Micron, 10″ cartridge. The 2nd stage filter is more crucial. A purification grade carbon must be used, also 10″ length. Premier recommends the customer use Premier’s G.A.C. 56 cubic inch carbon filter because our filters have more carbon than others, therefore, better filtration. The system’s various components are designed to enhance each other, thus the system will work much better. You can use other carbon filters; however, you may need to replace them more often due to their smaller volume of carbon.