Royce is one of the better known ones. Though I have run others. more or less the same thing. Chills/filters and recirculates. Sometimes old ink can get in the hoses or flow valve and clog. Good idea to replace hoses every few years if needed. Sock and chiller filters are replaced as needed. Valves cleaned or replaced as needed. Most hold 4 gallons of mixed solution. And work well for the most part. Which one are you looking at?