What kind? Upstream, Downstream, Thru the pump, After the pump, High pressure, Low pressure? The easy one is Thru the pump you need a float tank a tee a hose barb a metering valve, some hose, and a soap check valve with a filter on it.
------------------
Hotwaterwizard@aol.com John DeRosa If you have a Machine Problem, I'm here to help.