My Ninja ZPE cell design is fairly easy to build, extremely rugged and it is very easy to service for long life.
Another advantage is safety. The compression caps place an upper limit on explosive force. In the unlikely event a spark ignites the HHO gas within the cell it will blow a cap off rather than explode a PVC type design.
My design incorporates the Fibonacci sequence of spacing between each tube within the cell (like a Joe Cell).
I believe that the cell benefits from drilling holes to permit a vortex flow of electrolyte within each cell assembly. My design is a "forced flow concept" where the electrolyte flows via gravity feed to the intake on the first cell. The resulting HHO gas and liquid then flows from the top hose barb down to the intake barb on the next cell and so on until, the last cell pumps HHO upwards into the electrolyte reservoir. My reservoir design is unique and contributes to the incredible performance of my design.
When coupled with our Smart PWM we can adjust the HHO volume to automatically increase as the engine comes under load. The Smart PWM has different settings for HHO output for idle, highway cruise and for heavy load like going up a hill. The Smart PWM can be set up to monitor the electrolyte level in the reservoir and issue either a warning of low level or trigger a pump.
You can also monitor the conditions in the Ninja Cell system via a display window (mount the Smart PWM in the cab of the truck).
Taken altogether, I believe this is the most efficient and rugged HHO fuel system available. We have seen enormous fuel mileage gains on a variety of vehicles using the system (50-70% and higher).
The new Ninja ZPE is available with as many cells as required for engines from 3 liters to 24 liters including big marine diesel engines and diesel gensets. Visit the site at http://www.HHOTrucking.com for details if you are interested.