Slow water drip (by 2 users)

First of all it depends on the hardness of the water. Vinegar doesn't really work in the heavy lime belt area of the midwest. It is better if you use lime away. It is an ecolab product that is great at lime removal. Use one cup per pot. Then rinse two pots worth if this is the kind of machine that uses the same water that is put in during each brew cycle. Some brewers have a reservoir. Bunnomatic is an example of that kind of brewer. If you use lime away in that kind of brewer you need to run about thirty pots to remove all the lime scale remover from the brewer. Slow brewing can also be caused by over softened water. I drove from Indy to Iowa after installing a brewer and then a day later the store put in a softener and over softened the water causing the coffee filter to clog up with sodium. Also check the sprayer disc or head where the water comes out. Over time coffee "paste" will build up around the outlet and if you don't wipe it clean or "smear" the coffee grounds around the outlet that will slow down the brewing cycle. I have thirty years as a brewer technician and it is usually one of the things I have covered, providing that the heat element isn't defective.