I know you could give us the parts list on the APO but for us not so mechanically inclined it may be an idea for you to sell them!I had to overcome all of these problems that are mentioned in this thread when I designed the Savage Beast recovery tank. A smaller recovery tank will definitely give you an instant rise time in the vacuum recovery tank. For that reason I designed our tank to have a very small footprint (10" X 12"), and a foolproof APO. I am still using it today with over 17 years of use. I have virtually no foaming problems, unless the customer has dumped a load of soap onto their carpet, then I just clean and meter in Rinse-Master to kill the foam.
BTW, I am using the original APO pump still. It is the key in this type of vacuum system. I can also clean for weeks without having to check the APO filter.
The pump is an electro-magnetic drive pond pump. I have one in our Koi pond that has been ON 24 hours a day for the past 7 years with no FAILURES. I have one in each of our 2 truckmounts. Add a float switch, some PVC plumbing, a one-way check valve, and a pump pre-filter that gets a knee-high nylon on it, and you're good to go.I know you could give us the parts list on the APO but for us not so mechanically inclined it may be an idea for you to sell them!
That was my thought even in parallel the lift is usually 130ishThat test is utter bullshit. I am just testing 2 of my machines. One is a rustler 17 gallon with 2-2stage vacuums in series, single power cord and it develops 204 inches water lift. Testing my cleanworks monster with 2-3 stage vacuums in parallel, I still get 159 inches water lift. The gauge is wrong or you are deliberately sabotaging the test. Most machines are capable of 136-200 inches on a single cord.