I had a couple 510 att's that were about a 1.5 months old. These test subjects were producing very little vapor even though I set them to drain nightly. I used the waterpik on one of the lower settings to clean the atty's. I also read here on the forum that denture tabs work well to clean att's so I added one of those to the tank of the pik. Second, I rinsed with plain h2o via the pik. Then drained/dried att's approx. 36hrs. I think it worked really well as all seem to be working good as new now. Been using one for a week & it's still vapin' like champ.