Airlift Pump T-injector with 3-Hole Air Injector Disk

Airlift Pump with Air T-injector Modified to include a 3-Hole, Plastic Injector Disk

I am not convinced water pumping/circulating performance will be substantially improved by an air injector disk with multiple injector holes, instead of a simple T-injector.  But it might.

The following is the concept I would build if I wanted to use a plastic air-injector disk in a 4-inch diameter airlift pump (figure below).

- Injector disk would have three (3), 3/8” air holes rather than seven (7) smaller holes – to minimize fouling and calcium deposits (0.688 cfm air-flow per hole).
- Injector disk would be inserted into the air T-Injector rather than the water intake Tee.
- A threaded clean-out cap would be used on the bottom of the air T-injector to allow access to the injector disk holes for cleaning.

(Click figure for full-size image.)