Description
Class C05F : ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
Subclass 7/04: Fertilisers from waste water, sewage sludge, sea slime, ooze or similar masses (methods or installations for de-watering, drying, or incineration of sludge C02F 11/00) from waste liquors in the potash industry