Nice lady at information office in Zonza told me that it is dangerous and only for canyoning enthusiasts with special equipment.
BUT In my opinion it is nice trekking to see beautifull canyon.
Receomended even with fit 6 y.o. children. Of course if you are brave, proffessionaly equipped, with guide - you can see a lot more, and have more...
The hike can be a little tough but the reward is so big that you won't regret all the effort you made to get there. Don't stop at the first pool you'll see but keep climbing to see how beautiful the canyons of Bavella are.