What you will do if you have diffusers at various depths is when you turn the system on notice the shallowest diffuser is getting most or even all of the air (depending on the depth differential and if your diffusers have internal restrictor orfices or not). You will then simply start slowly shutting down the air to that diffuser and force more air to the deeper ones. May take 30 seconds after each adjustment for equalization. Leave the deepest valve wide open and reduce flow to shallower ones as needed. You will see the pressure gauge rise as you partially close some valves.

If you have a pressure gauge it will read according to the depth of your deepest diffuser (because it takes that much pressure to push the air to that deepest depth).

Note your final pressure and write it down near the pump. If you note a preseure rise over time, something is starting to restrict air flow. Even a couple tenths of a psi means diffusers may be getting clogged. But pressure is not a sure sign. They are likely clogged and opperating less efficient long before a pressure rise. I like to clean them once or more a year.

Last edited by snrub; 03/15/19 08:58 AM.
John

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