well my ro di took a dump some time in the last day or so. I learned some new stuff from the filter guys, and thought i would post my issues for a second oppinion. well I found I had no output, My first thought was the diaphram auto shut of valve on the di unit. so I called the filter guys and here is what i have come up with. 1. my water bills have been high latley, I thought the auto shut off valve shut the compleate system off I learned it only shuts the dump water off and if the pressure is under 40 or so it will not shut off ever. I think I Have been dumping water 24-7 for a while now as knoxville has low water pressure. 2. Low water pressure can cause a membrane to fail. 3. citys are using some stuff now in the water purification process that has been causing a lot of filter plugs 4. I did have a carbon block filter pluged/ noticed failure internal as it was bulged. I run in this order 5 MICRON POLY SEDIMENT FILTER / 1 MICRON POLY SEDIMENT FILTER / MATRIKX +1 CARBON BLOCK FILTER CHLORINE GUZZLER / MATRIKX +1 CARBON BLOCK FILTER CHLORINE GUZZLER / 75 GPD FILMTEC RO MEMBRANE / NON COLOR CHANGING NUCLEAR GRADE DI RESIN / NON COLOR CHANGING NUCLEAR GRADE DI RESIN I am going to replace the membrane, and add a booster pump, I think my water savings will pay for the booster pump, and I think everything will last longer/ work better. I had been puting this off as I did not want to spend the cash to get a booster pump. I now feel it has actually cost me I think it was Ein that said he added one because the membrane's only work at rated eff when under correct pressure. and thought it would make his di resin last longer. wish I had a gallons used meter so i could of compared. but will post if I feel my di lasts longer and my water bills go down a little.