Amazon.com : LTWHOME Replacement Coarse Blue Pre-Filter Foam Fit for Eheim Pro 3 250, 250T, 350, 350T, 600/ Ultra G Pro 3 Filter 2071,2073,2075 and Eheim Pro 3e 350/2074 (Pack of 6) : Pet Supplies
Reliable in all classes | EHEIM GmbH & Co. KG. Leading aquarium manufacturer.