aeroponics need reliable external pump with pressure for 40 spray heads

Hi all I am growing in 6- 8" PVC tubes 6' long with 40 spray heads, feed tubes are 4 pieces 3/4" 6' long and roughly 2' rise from pump to spray heads (in a loop)

i am looking for someone who may know of a quality external water pump with enough pressure to spay 40 heads that can run continuously?? any help would be greatly appreciated

Also a continuous use pump would be great something that i could start clones with as well as on a timer.

I have tried most all pond pumps but not enough pressure,I bought a little giant submersable pump which works great (except for the heat it generates) but i would like an external pump

5 year old post but I am looking for almost the exact answer except I have a 3 tier vertical 6" PVC that I need a pump that is external that can Power 45 ez clone sprayers when the top tier is 7' high.

Any low pressure Aero hero's here?