Originally Posted by
Terence
I think the confusion is that people see the 2000gph rating on a pump and think “ok, I am sure have some head in my system, but there’s no way it could possibly be enough to cut that flow more than in half”
There are charts you can use. They are plumbing charts. The two to look at are the line loss per 100’ of straight pipe chart and the fittings equivalency chart. Pulling from memory, 3/4” pipe, with no fittings at all, just 100’ horizontal of it, has the equivalent of 19 feet of head pressure. Now look at the equivalency charts for the fittings. And then that valve thingy the RS has.
Save a pump like the Abyzz at 3-4x the cost, there are no DC pump alternatives I know of that will give you the psi necessary to overcome constricted plumbing in the RS.
If you want a comparison, put a sweeper nozzle on your garden hose. See how much psi is required to get any kind of volume (gph) of water out of it. And, once you do, look how far it sprays and with what kind of force at say 6” from the nozzle.
This situation with the RS is like getting a car with a great engine but the wrong gearbox or rear end.