RED SEA - FILTER MEDIA CUP 4" Red Sea Sale! from 1499 /per Qty. Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. RED SEA FILTER MEDIA CUP WITH FREE MEDIA BAG. An easy-to-clean alternative to our micron filter bags, suitable for all Red Sea REEFER™ & MAX® systems.Holds 1 liter of filter media with optimal water flow. FREE media bag included.