150gph pump enough?

for a diy sprayer system like stinkbuds, or the others that use pvc pipes and rubbermaid containers?/

what size of pipe you plan to use?

you want at least a 396, many on SB site use a 633 for a better spray pattern.

1/2". the next size up that i i would be accesssible to would be a 250gph pump.

go with the 250gph...not just for the capacity increase but the head too...sprayers like pressure

You want something with high pressure. If you just spray the roots it ends up being nutrient film technique.