Question 1

How much water does an industrial RO plant waste?

Accepted Answer

Reject volume depends on the recovery rate. A brackish-water plant commonly runs at 50 to 75 percent recovery, so for every 1,000 litres of permeate you produce roughly 330 to 1,000 litres of reject. Recovery is set during design based on the feed analysis, and reject can often be reused for washing, cooling make-up or landscaping.

Question 2

How long do RO membranes last?

Accepted Answer

Typically two to four years in service, but this is driven by pretreatment quality, cleaning discipline and feed chemistry rather than age. Membranes fouled by iron or chlorine can fail within months.

Question 3

Can I run an RO plant on deep tube-well water directly?

Accepted Answer

Rarely without pretreatment. Most Bangladeshi tube-well sources carry iron, manganese and hardness that must be handled upstream, otherwise the membranes foul quickly.

Question 4

What is the difference between an RO plant and a DM plant?

Accepted Answer

RO is a membrane separation that removes most dissolved solids; a DM plant uses ion-exchange resin to remove essentially all ions. RO is normally cheaper to run at volume, and the two are often combined with RO as pretreatment to a polishing DM or mixed-bed unit.

Question 5

Do you supply a water test before quoting?

Accepted Answer

Yes. We can collect a sample or work from a recent laboratory report. Without a feed analysis any capacity or price figure is guesswork.