Originally Posted by Zspray
Just FYI, at 40 psi you are bypassing very little. To get the full 4gpm for agitation, open the throttle valve which will decrease your pressure. Take your pressure down to as low as it will go with the boom valves closed. This will give you full agitation for mixing product.
I didn't realize this till you guys told me this some time ago. So now between spraying I do this.
I also went to the 5gpm (not for this reason) pump and wonder if that helped?