General Reverse Osmosis Questions
How do I determine the flow rate in my home?
If you need to figure out the flow rate in gallons per minute of a steady flow in to a holding tank, or open discharge: To estimate the flow rate of water into your home:
Can an RO System achieve 100% recovery or 100% separation?
No, 100% separation is not possible with thin film composite membranes. Also,
100% recovery is not possible with thin film composite membranes. With thin film
composite membranes, there are always three streams (feed, concentrate, and
permeate). As the permeate water is being produced, the feed water is being
concentrated, but it can not be separated 100%. Also, since there is always a
concentrate stream, 100% recovery is not possible. Percent recovery is defined
by permeate flow rate divided by feed flow rate x 100%.
What is the difference between NF & RO?
Nanofiltration is a membrane liquid separation technology that is positioned
between reverse osmosis and ultrafiltration. While RO can remove the smallest of
solute molecules, in the range of 0.0001 micron in diameter and smaller,
nanofiltration (NF) removes molecules in the 0.001 micron range.
Is there a minimum daily run time on RO membranes to keep the membrane healthy?
No, but it is better not to let membranes sit stagnant for long periods of time to avoid possible microorganism growth. If a system is going to be down for more than a week, then the membranes must be cleaned and system stored in a preservative solution. See the articles about RO & NF System Shutdown and RO Membrane Preservation & Storage. Running it for a few minutes every day accomplishes the same thing, but if it is down for less than a week, it should be fine.
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