I stopped by a local sprayer company today and a few things he mentioned about centrifugal pumps and why they do not use them in many lawn applications. The reduced psi will have difficulty pumping 300 ft (the length of the hose) Also, centrifugal pumps can not be run dry like diaphragm pumps can. Meaning you better not run dry at the back of the house or your pump may be shot by the time you get back to it to turn it off. Lastly, not a huge deal but since you can not run them dry that means you can never use all the compost tea, resulting in a bit of unused tea every day. I have never heard these points discussed about Centrifugal pumps so I thought I would bring it up.