This Algae scrubber is still in development. Presently my prototype is working great.
The top hole, or water inlet, is 3/8" NPT tapped to provide the maximum number of connection possibilities. a 3/8" barb end is included.
The bottom hole, or drain, is 1/2" npt tapped and a 1/2" threaded output male-male adapter is provided.
Mesh insert is provided for the algae to grow on.
This is designed to work with many available COB style LED fixtures like this: https://a.co/d/4j6TVvw