The Red Sea Reefer Filter Media Cup (Free Media Bag), offers a hassle-free alternative to traditional 4”/10cm micron filter bags. Designed for easy cleaning, this cup is suitable for all Red Sea REEFER™ & MAX® systems. With a capacity to hold 1 liter of filter media and ensuring optimal water flow, it provides an efficient solution for maintaining a pristine aquarium environment. Upgrade your filtration system with this user-friendly and effective Red Sea Reefer Filter Media Cup, now with a bonus free media bag included.