Hi, I just started doing some pw on the side earlier this summer. I got alot or my stuff from Pressure Tek. Nice folks. I am using Simple cherry and f13 and some 10.5% chlorine from a pool supply for washing houses. I was using the downstream thing on my pwer. The other day i checked it and it is only putting out about 1 to 20 ratio. I bought another one from PT and put quick connects on it and it puts out maybe 1 to 15. It was a 2-3 gpm and my pw is a 4 though. How do yall guys that ds get it on strong enough?