Do the following: Drain fill tank, Remove charcoal filter pack, back wash fine mesh screen, run vinegar through system when doing this let the brew tank fill, make one cup then let the vinegar sit a few hours..last run plenty of clear water through brewer to remove the vinegar and any scale that the vinegar loosened,, put in a new charcoal filter (you can buy these at the store where you purchased your Kr.. last get a push pin (like you use to tack notes to a bulletin board).. prior to making a cup, use the push pin to make a small hole near the center of the K cup... this will relieve the pressure in the cup...do this for all K cups prior to using your K brewer will most likely never clog again... do the cleaning process about ever 6 months, but again.. use the push pin all the time... Paul Battaiola