Can I use propylene glycol with the Cooling Pump Kit? We do not suggest using glycol with the Cooling Pump Kit The pump is not designed to handle a liquid of that viscosity, and it is therefore not recommended that glycol be added in more than 5%. Related articles Could I be getting a metallic 'Off-taste' in my beer from the fermenter? Can I add fruit/other adjuncts directly to my fermenter? Can I use a Mashing/Grain Bag with my Grainfather? Estimated Delivery Time - New Zealand Mashing - the general process