I know this is older post @Jim Davisson
, but word bladder caught my attention. When I was putting my TM together recently, I've asked installers to put bladder tank in also( I had it for a while, so I thought, I put it to work). I've been using flojet 4.5 Gpm pump for many years and I find it reliable. To my surprise, answer for my request caught me off guard. I was told that nowadays demand pumps are quite sophisticated that they don't call for presurized tank . Unfortunately pump froze in winter time and got damaged, so it was time for a new one. Since I live right by RV place where I'm getting propane, I decided to give a shot and bought in their " house " brand Shurflo pump 3.2 GPM. I was worried that pump won't keep up with tile& grout job, but that wasn't a problem . The problem is that I went trough 2 pumps in 6 months. What happens, pump is working just fine to the point that starts to work intermittently, sometimes with help of the hammer I'm carrying with me. Both pumps developed same symptoms, which I have to address with a manufacturer pretty soon. I put in( my mistake) flojet pump 4.9, which caused tremendous whirlpool in my 7x11x12 holding
( hot box) tank and broke off the arm of the float assembly almost immediately. In retrospective, expansion tank would be providing some help with outrageous pressure. Learned my lesson... So , I'm on my 3rd Shurflo , delivering water for about 4 ' away, 3' vertically trough 1/2" hose and waiting on Flojet 3.5 GPM, hoping that my luck turns for the better. My last Flojet pump last 5 years, without causing any problems. What is going on with Shurflo brand ? Anyone else had a similar experience? I would like to know, please. Am I using wrong pump for carpet cleaning application? ( It is diaphragm 4 chamber pump). I had it wired to engine on/off switch, so it's under low electric current only during the cleaning.