My pressure has just dropped from 60 to 40. I keep nicking water off my mate as his system does something like 2.5 liters a minute. Mine does about .5 a week or something. No honestly, I bought mine for the backpack but now I have a tank I need something bigger and now my pressure has dropped I'm still pinching stuff off him until I decide if I'm to buy a bigger filter system or just change my membrane and pre filters. I've just changed my DI as the tds was creeping up.