I have the Silvonic 1G from Elixa.com that makes a gallon at a time, has a magnetic stirrer, and a lifetime warranty. www.elixa.com/silver/Silvonic1G.htmI checked out all the other systems and these guys answered all my questions clearly and quickly. Excellent customer service and fast shipping.They also have an inexpensive nebulizer and an ointment kit.Cool instructional videos too. I follow their advice about usage... "when in doubt, use more!"Abe