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Frequently Asked Questions
Is it just a larger membrane?
No - the whole arrangement changes.
Banks of membranes in pressure vessels.
Driven by a high-pressure feed pump.
Because mains pressure will not do it.
It becomes plant, not an appliance.
Why is a feed pump necessary?
Because pressure drives the process.
And more membrane needs more pressure.
To push enough water through it.
Mains pressure runs a single cartridge.
Not a bank of them.
What is different about storing the product?
It has no disinfectant left in it.
RO removes that along with everything.
So it is stored with no residual.
Which makes tank material and turnover.
Matter far more than for raw water.
How big is the reject stream?
Cubic metres, at building scale.
Which is a water cost.
And a discharge question.
Concentrated reject may need consent.
Ask the undertaking before designing.
Can the reject be reduced?
Yes, by recovery rate and staging.
Staged arrays feed one stage's reject.
Into the next stage as feed.
Which raises overall recovery.
At the cost of complexity.
Why does pre-treatment grow so much?
Because the membranes are the expensive part.
Sediment, carbon, sometimes softening.
All of it exists to protect them.
Chlorine especially destroys membranes.
So carbon ahead of them is essential.
How is it known to be working?
By instruments, not by assumption.
Conductivity across the membranes.
Pressure differential across each stage.
And a cleaning regime on a schedule.
It is a maintained installation.