Im having trouble keeping my water at 000, I have a merling RO unit and a 4.6l DI unit ive changed the prefilter and both membranes and it is going into the DI unit around 020 and coming out at 000 for a few days then its creeping up to 003 and so on til it reaches around 010 after about 9/10 days and I swap the resin its all brand new resin and I cant figure out whys its doing it, it used to last weeks before changing the resin.
Thanks