Venturi Eductor Mixer

Venturi Eductor Mixer for my reef aquarium. Based on traditional eductor mixers typically used in tanks for mixing without equipment with moving parts.

Technical Design notes:
Eductor section is designed as a venturi nozzle per ISO 5167-1 (1991) pp. 28 & 37
Outlet diverging section has included angle of 8 degrees (typical of traditional venturi tube)
Inlet nozzle has inlet included angle of 21 degrees (typical of traditional venturi tube)
Annulus for outside flow, spacing between inlet n