Dear Dr. Brew,
I visited a new customer who would like to switch to our coffee from a national distributor. They were not happy with the strength or flavor of their current coffee. But when I brewed an airpot of our fresh coffee on their current equipment, the result was uninspiring.
Upon inspecting the grounds I could see that they had not risen in the filter, and along some edges were dry grounds. I then used the deliming spring (and there was a crust), but when I cleaned the sprayhead I noticed only five small holes instead of the six which is standard on a CWTF-APS brewer. And even with the deliming, there was still very little evidence of the grounds floating on the next brew. I will be supplying a standard CWTF-APS with six holes. What is the purpose of the five-hole sprayhead?
There are several optional sprayheads with various patterns and hole sizes. You are correct that the original sprayhead is a six-hole pattern. A few reasons the sprayhead was replaced with an alternate design would be to alter flow rate into the funnel. The five-hole design has a more narrow pattern and a slower flow rate than the six-hole. (Find out more about the role flow rate plays in BUNN Coffee Basics.)
The previous coffee provider may have been trying to increase contact time in the brew funnel with the ground coffee. I have known operators to use the slower flow rate to compensate for softened water.
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