Q: Hi, what is the size? Do you send to portugal? How much is?
A: This product along with all 4-sided cartridges have been discontinued by the manufacturer, Mars Fishcare. If you have one the NEXX filters you can still use any pouch or bagged media in the chamber. Just replace the 4-sided cartridge holder. If you have the old RENA hang-on filter, that was discontinued 8 years and I don't know if any other type media would work with filter.