“I think a waste of money the cone doesn't smell strong they only last about 10 minutes, the idea of the waterfall is good but the cones needs rethinking once they have quickly burnt away they leave a really foul acrid smell so you need to thoroughly wash every single time or you Can smell this acrid smell every time you walk past it.
The cones need to smell stronger and they need to be bigger and burn longer just not worth the money or fuss, I have some non back flow Insense cones they smell beautiful and burn for 45 minutes. Sorry don't recommend the back flow cones at all.”