Anybody who has ever adjusted a hose spigot knows the difference between high pressure and low pressure.
When you want to blast spider webs off the side of the house, you open the spigot all the way to get high pressure out of the hose.
When you want to water your tomato garden, you open the spigot just a little bit so you don't beat the poor plants to death.
This isn't rocket science....
Bill Robertson
#5939