At our cafe we use a 3 group linea and have always left spent coffee pucks in the portafilter between brewing to maintain temprature in the group. This is something we have done for quite sometime. Recently we have been having problems with our group screens warping and spitting water out the side. One person i have talked to thinks the two are related. Does anyone else leave the spent coffee in the portafilter between shots or has anyone had problems with their screens?
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