I am about to scrap my 3000 R20 +Plus because the brine tank keeps filling-up.
I had serviced the venturi and it's filters, the brine filler and re-lubricated the valve faces but still no joy.
Being a DIY I have a hard time justifying $500-600 for another unit (the Ecowater being VERY overpriced and will not be purchased again) for something that seems like it could be fixed.
Saturday morning, decided to give it another go and then I saw it, water dripping from the top of the resin tank, down the side, into the brine tank. Probably was dripping behind the resin tank before which was why I did not see it. This would also explain why the top of the resin tank was wet and shows some resin residue. I thought the water was from the valve when I disassembled it and the resin from a spill when the installer filled the tank.
Now I know how to proceed and hope this 'discovery' is helpful to someone else.
I would recommend wrapping a paper towel around the resin tank to detect if there is a leak where you cannot see it.
You may all want to know that the owners manual can be found here: http://www.portasoftnj.com/docs/ECO3000.pdf