So there you go, then ... the field is wide open, restricted only by what is available to you where you are, and how good their (the contenders') service support is reputed to be!
Will you be going out to tender? If so, you (obviously) need to get the specification spot-on, with emphasis on the desired (guaranteed) water quality, plus sufficient volumes for all foreseeable needs
etc. You need to work out your requirements for storage capacity, also. Base this on how much all the machines will continue to need if the worst happens, the plant goes down, and how long it is likely to take (based upon your current experiences) to bring it back on line. You might also want to think about having built-in redundancy (that is, extras, or stand-by's) of key elements. Or even
duplicating the whole thing. That is, having duty and stand-by sections (banks, paths) ... maintenance becomes a whole lot easier that way, without disruption.
You also need to make the issue of demarcation absolutely clear. That is, where does the water treatment unit begin, where does it end (at the machines?), and who is responsible for what!
I guess we can assume that you already know about any incoming supply problems you may already have, and what the quality is like there.
And when talking about service support, be sure to pin them down on things like response time, stand-by equipment, and spare parts stocks (especially filters, and things like that) ... they will most likely agree to anything when you're actually buying the kit. So that's the time to factor in the maintenance as well!
