I dont have tech skills like you or SPRUCE.
you can say that again

I get what you are saying, I had a shuflo that packed up, so I replaced it with the vyair, which is a lot smoother and quieter than th shuflo, but the controller has to be a lot higher to get the same flow as the shuflo even though they are both 5L pumps

I might try a flojet next, if I can afford one, my customers aren't as generous as your with you extravagant tipping
