If the Highway Sawangan, benokan Ciseeng terminal or large banyan tree on the roadside. I happen to be from Lebakbulus, so this terminal and banyan tree are on the right side of the road. Near the terminal and this tree there is a fork to the right. Just take this road until you meet an intersection. Go right to Serpong, go left to Tirta Sani. To go to this bath, the gas station stands on the left. Not far from this gas station there is a signpost on the left side of the road: Tirta Sani Hot Water Bathing. Location of baths not far from this signpost. Most of about 200 meters have entered the parking lot.
If from Serpong will be easier again. Take the road to Puspitek Serpong and straight, to see the intersection that if left to Jalan Raya Sawangan. If through here there is a bonus. On the Puspitek to Ciseeng crossroad there is a good soto stall (my friend said lo). But when it did look crowded, the parking lot full of cars when the shop is very simple.