The Red Sea NanoMat is a drop-in replacement for the filter socks in MAX NANO G2s, REEFER G2s, and all standard 4” filter socks. It keeps the water crystal clear, does not require an internet connection, and features a processor-controlled drive unit with a solid-state sensor that automatically advances the roll and lets the hobbyists know if anything needs their attention.NanoMat Features: Plug & Play installation Easy fleece-mat replacement system Efficient, high-flow, skimmer friendly, 50 gsm, nonwoven polyester fleece-mat rolls Solid-state water level sensors (no moving parts) Auto Shutdown to prevent fleece wastage Specifications:Recommended for systems up to 200LFleece Mat Roll Width: 5.5cmFleece Mat Roll Length: 18mUnit Dimensions: 10 x 9 x 41cm.Directly compatible with the following Red Sea G2 aquariums: REEFER™ NANO G2, REEFER™ G2 170, REEFER™ G2 XL 200, REEFER™ G2 170, REEFER™ G2 200, REEFER™ G2+ 170, REEFER™ G2+ 200, REEFER™ MAX G2+ 170, REEFER™ MAX G2+ 200, MAX NANO G2. For full compatibility, please see the Red Sea website here.G1 models and earlier would require a sump modification with the Red Sea Sump Modification Kit (R35475)