So here's our issue we are having. When we spray Round Up WeatherMax, it foams like a bit#h. Like to the point that when we spray the tank out, it is literally right full of foam, so as soon as you start filling again, it bubbles up out the top. It only does this with Weathermax. On the pump, it has a small 1/4 inch inside diameter hose that goes from the top of the pump up to the top of the tank. It is constantly circulating fluid. Am I correct in thinking this is only there to bleed out any air from the pump when it is run empty? And would this be causing the foaming issues? It looks like the same pump on our old Flexicoil pull type and it just has a bleeder crew in the same hole. Could I put a valve on this so I could close it off when I don't need it or will that cause other issues? I know it's not the water because we use the same well as others that use it and they have no problems.