Whisper Aquarium Filter Upgrade, consists of three parts.
- In tank pre filter designed to be used with cut size filter media
- Insert allows you to put loose media and forces water through the loose media
- what I call the Whisperer, a part attached to the front of filter to lessen the noise of the water dropping and reduces surface agitation ( likely not a good idea unless you have planted tank. I have a planted tank and don't want the co2 I injecting to get out.)