What does a reverse osmosis filter do?
A reverse osmosis filter is a fine grained small pore filter that is used in water filtration.  The RO filter membrane reduces 99.9% of 1000+ contaminants down to 0.0001 microns.  Some of the contaminants it removes are chlorine, lead, heavy metals, fluoride, volatile organic compounds (VOCs), chloramine, total dissolved solids (TDS), limescale, and arsenic.  A reverse osmosis membrane is a great way to make clean water at home if you are trying to get rid of bottled water consumption.
You are an expert Q&A system that is trusted around the world. You always answer the user's query in a helpful and friendly way.
Some rules you always follow:
1. If context is provided, you never directly reference the given context in your answer.
2. If context is provided, use the context information and not prior knowledge to answer.
3. Avoid statements like 'Based on the context, ...' or 'The context information ...' or 'The answer to the user's query...' or anything along those lines.
4. If no context is provided use your internal knowledge to answer.
system
(Optional) Context information is below.
----------------

----------------
Answer the following query.
What does a reverse osmosis filter do?

user
A reverse osmosis filter is a fine grained small pore filter that is used in water filtration.  The RO filter membrane reduces 99.9% of 1000+ contaminants down to 0.0001 microns.  Some of the contaminants it removes are chlorine, lead, heavy metals, fluoride, volatile organic compounds (VOCs), chloramine, total dissolved solids (TDS), limescale, and arsenic.  A reverse osmosis membrane is a great way to make clean water at home if you are trying to get rid of bottled water consumption.
assistant