I bought a gallon of cold, pure water.

As the water passes through the filter, the chemicals are purged, leaving pure water and a streak-free finish (though you should still remove excess water).

They scoop up polluted water, spin it, pump the oil into the hold and return pure water to the sea.

There's a spring on my farm which produces absolutely pure water.

He plays a scientist who invents an energy-generating process that uses pure water.