I've been using the SoClean 2 with my S9 for a couple of weeks. I've not noticed any pressure decrease. My only complaint is with the small rubber hose that goes into the humidifier. It makes the removal of the tank difficult. I've been having to carefully fill it with the tank in the S9 base. DITT...

I use SoClean2, hand soap and an ultrasound cleaner from Harbor Freight.

Will someone be kind enough to share the link to the software download? Thank you so much.