The Koine 3.1 is designed to be a continuous pump for feeding bags of dry material such as underlayment, mortar or grouts. But when you need to mix the material with lots of additives which require longer mixing times then switch to wet mode, use a seperate mixer such as the Mix 120 and pour it into the hopper to use it as just a pump. This gives the flexibilty and versatility to be used for any application. Rinse out the hopper when finished.