650lts per day. I make my water at 002 rising to 005 at the end of the fill. What i did yesterday was remove the pipe going into the resin filter and took a reading before resin and it read 006. The filter has been on about 3 weeks and it's nearly brown from blue. I'm still getting 000 after resin, but my last resin filter only lasted 8 weeks, surly it should last longer than that, as my first filter lasted 8 months. I'm thinking it could be the roback filter putting higher tds water back in to the system as the reading i took yesterday was 006 befor resin.