Question 1

Should I install RO or a DM plant?

Accepted Answer

It depends on the outlet specification and volume. RO is cheaper to run at volume but does not reach the very low conductivity a DM plant can. Many plants use RO followed by a mixed bed, which gives the specification at a much lower chemical cost.

Question 2

How often does a DM plant need regeneration?

Accepted Answer

It is driven by ionic load and throughput, not by time. A conductivity meter on the outlet is what tells you, which is why the instrument matters.

Question 3

Is chemical handling a problem?

Accepted Answer

It requires proper storage, protective equipment and trained operators. If a site cannot support that safely, an RO plus mixed-bed arrangement with off-site resin exchange may suit better.