Hi All Just thought i would show you this nifty TDS Meter then tell you a little story. Okay so Thanks to Marco from TheWaterBoy. Always great service and speedy!!! So i was always worried about my TDS of my RO Unit. Also not knowing when to change my cartridges and if my TDS was causing my algae. So what i did was install the new flush valve for my RO unit which didnt have a DI unit. I then tested the TDS of the outlet and it was 64!!!! I then flushed the for about 2 minutes. I then checked again and it was at 32!!! I was getting somewhere. I then flushed it a few more times after that and it was dropping 20, 16, 13, 4 and then finally 2. Just to let you know this didnt have a DI Unit yet. I did purchase one which i will install tonight. I cant belive how much of a difference the flush valve makes to the unit. VERY CHUFFED!!! Thanks!