Some users have found a significant improvement in product quality when the T4 is used in a cold environment, down to about 41° Fahrenheit (5° Celsius). Warm environments increase the transfer of plant material to machine components. Most varieties of plants process much better when harvested within several hours of being watered. Multiple T4s in line (2, 3, or 4) can drastically increase performance and output. A steep incline will be required. 5 Gallons of ice water with a few drops of dish soap is the best non-oil alternative.