So, Dom, are you saying that we could buy say, a tank, pump, resin cartridges, blank poles from excel, pole fittings from whoever, an RO unit and put it together ourselves for less cost?
Thats great for those among us with an adventurous spirit,
Long live the home putter-togetherer-of-kit!
I'm a great advocate of it.
An advantage, is that you can build your own system to suit your exact requirement
Also, since you built it and know how it works, if something goes wrong, you'll have a good idea how to fix it.
A disadvantage - no crash testing
silly