Product review (5 stars): Finally got it working!
We purchased a Pure Wash 2 months ago.  Installation was very easy.  We did a test run......no bubbles!  I called the company the following business day and a very nice lady advised me we would need a "y" connector as our washing machine was a super low flow (brand new Whirlpool Duet) She even emailed me instructions.  Well hubby promptly purchased the connector and followed her instructions........still no bubbles!  We then started considering returning the unit.  As a last ditch effort, I called the company again.  The same nice lady apologized and connected me with one of the company's engineers.  The engineer also apologized for the problem and advised that the make and model of our washing machine has an internal water restrictor.  The fix for this is an internal  gut swap out.  She promptly mailed the new internal workings along with a step by step replacement guide and offered to walk us through the replacement.  I know this sounds like a major thing, but it was extremely simple.  Took the hubby all of 5 minutes and we didn't have to call.  Welllllll, he reinstalled the unit, reconnected the hoses and the thing went bubble CRAZY!  Aside from the bubbles, I knew it was working when the air inside my laundry area smelled like it does after a spring rain storm.  I have using this for over 6 weeks and cannot rave enough about it.  Pros:  very well cleaned clothes-although I still pre treat set in stains (kids clothes).  I don't have to separate lights/darks.  Towels smell completely scent free (best smell of all) and no hot water usage. Cons:  while researching this product I read a review saying they did not have to use dryer sheets to combat static cling......not true.  I tried drying without a dryer sheet.  Pulled a freshly dried sweater over my head and my hair stood on end!  LOL.  So to those of you that are having problems getting the unit to bubble, don't immediately return the unit, call the company.  They provided GREAT customer service and got our machine up and running.