From Chiang Mai Super Highway at Mae Jo traffic light (Thepanya Hospital) take road 1001 direction Phrao. After 50 kilometers, remaining on the main road, you will reach Baan Pha Mai. After the village, take right, direction Bua Tong Waterfall. The factory is on your right hand side.
There are many signs Natural Agriculture (both in English and in Thai) along the way.
Please see map with the exact location: N19”05.347 – E099”05.20