Is CIP (clean in place) possible on the G40? Yes! For more details on this process please consult the cleaning section of the G40 full instructions. Related articles Instructions - G40 My G40 sight glass doesn't always show the same measurement or appears to be off by a little bit - is something wrong with it? What do I clean the Grainfather brewing and fermenting vessels? How to use the G40 Whirlpool Arm Can I use PBW cleaner on the Grainfather Brewing Units?