The Blue Reef 1000 comprises following components: Filter sump with filter tower including the patented drawer and biofilter, filled with BactoBalls. Turboflotor Blue 3000 protein skimmer installed in the sump. Ocean Runner OR 3500 circulation pump installed in the sump. Pipework connections to the aquarium: 25 mm flow, 40 mm return All components are inside the filter sump. Ready for the connection of a Refugium.