In desalination and reuse, the heart is basically a combination of a steel frame + pressure vessel + membranes inside.
So you want a good membrane. Inside a reliable pressure vessel. And nicely supported by a friendly steel frame.
(I know later come the pumps, the pipe interconnections, valves, energy recovery devices — it all counts...)
But today we talk about:
The strategy for how to deploy the heart into our project.
Who are the surgeons in the market?