Well, Vertex claims...

"Lifting rate data represents total water flow recorded by independent testing and real world data collected by Vertex from installed aeration systems. Lifting rate varies significantly by air flow, water depth and other factors. XL8 data extrapolated from XL5 data."

From this page...

https://www.vertexwaterfeatures.com/aeration-lifting-rates

It's all I've got to go on. The nice thing is, if I ignore the 4 foot diffusers, I am still turning plenty of water.


Fish on!,
Noel