Repti Clear 2 Coarse Foam F350Replacement Coarse Foams for Repti Clear F350 2 Coarse Foams for the Repti Clear F350 (PT3620) Terrarium Filter. Instructions 1. Unplug the filter and remove it from the installation. 2. Separate the filter case (C) from the motor housing (A). 3. Remove the carbon cartridge (B) from the filter case (C). 4. Remove the large foam pad (D) and replace with new foam pad. 5. Replace carbon cartridge (B) on top of foam pad (D). 6. Re attach the filter case