I bought the COFFEEDUCK hoping to be able to use regular coffee in my Senseo and was quite happily surprised. The coffee came out great. I like my coffee strong so I fill it full without packing it down and press the two cup button and then the one cup button using a very large mug. I also grind my own beans and grind it very fine like for esspresso using a Magic Bullet. It comes out just perfect! You can adjsut the amount of coffee you place in the coffeeduck also.
I have the basic Senseo 7810 and have not had any leaks or problems with the Coffeeduck. The directions say not to let any of the coffee get on the seal and I am very careful to follow that tip. After your coffee brews, empty it and run it under some water and it is ready to use again.
****Do not pack or press down the coffee as it does leak if too much packing is done. I love strong coffee, so I put 1 tsp and pack that down in the bottom and then add to the top middle making sure not to get any around the edges. Firmly push the black lid over the coffee duck and brush any particles out of the rim.

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