No need to do boxed water. You have the right idea making your own RODI
water. With that you can be assured of the quality and mixing your own SW
you can get all the beneficial elements needed. You have the right parts for your RODI
unit all you need to do is get it working correctly and maintain it. You can also always add to it (as in more stages) in the future if you find you have the need. Don't give up, you're on the right path.