All of the BRS reactors come with easy to use push connect tubing, flow control, and a refillable cartridge. We took easy to find components to keep things cheap, while designing an efficient easy to refill reactor for aquarium use. We keep hearing our reactors are the easiest to refill even when compared to others three times the price. When changing the media is easy you are more likely to do it in a timely fashion as well. We also recommend having an extra refillable cartridge on hand to make changing media that much easier.