4 Pack: The AquaHouse AH-CDE is a premium compatible water filter designed to fit DeLonghi coffee makers Compatible to replace DeLonghi water filter cartridge reference: DLSC002, SER3017, 9310926, 5513292811 and any other filter model of this type (shape/size similar to picuture) This will fit all DeLonghi coffee makers which use this type of filter, including Espresso and Bean-to-Cup machines EC800, EC820, EC850, EC860, ESAM, ECAM, Magnifica, Primadonna, and any other DeLonghi coffee maker using this type of filter The filter contains a high quality carbon and resin to remove chlorine and limescale from the water, to improve the taste of the coffee whilst also protecting the machine from limescale. Each filter lasts upto 2 months / replace as required. AquaHouse branded filters, AquaHouse is a registered trademark.