I find the Sprint nebulizers to be the cause of prolonged nebbing for me. It doesn't matter what compressor I use, it takes longer. And maybe I just don't know how to use it correctly, but by the time I am done, I feel like I have been running for 15 minutes. So, I went back to the old, cheap generic ones and I am happy.
Sue

I have Pari Green and Pro Neb from Pari. Used with sprint cups. I have found that how you clean them is the key. Soaking in vinegar will dissolve any build up from hard water. I also notice that since we had new tanks for our whole home water purification system installed that the cups are working even better. One of the tanks is a descaler for hard water (which we have). So now when I boil the cups for 5 minutes it is not an issue (the hard water). But could be your compressor is needing a swap. They will send you a new one for free if you call them. Or if the filter needs changing that can make a BIG difference. Both my systems only take under 10 minutes on average. To me they go too fast and I often use a second vile of saline since I need to nebulize for some time to get benefits!

Hi @lorifilipek and @sueinmn
I've had this problem off and on with the Pari Vios Sprint. I called the Pari Vios company to complain about the time it takes and that the solution gets foamy in the cup. The rep told me since I was nebbing 7%, not 3%, that I should alternately clean my cups with sudsy hot water and then the next time, boil for 5 minutes. That helped a lot. But only for a while. So I ordered new cups and the first time it took me over 15 minutes and it was still foamy with solution in the cup. I called the company again and complained. My compressor was only about a year old but they said it was the compressor failing and they sent me a new compressor. Works great now...takes maybe 7-8 minutes. Hope this helps. Think next time I will order a different compressor system and the older style cups from Pario Vios, Not the Sprint. Good luck. Kate