Filtering out pollution would be adding the pollution to the ecosystem because it is not being destroyed, just trapped. A small percentage of "pristine" cannot be found anywhere on the planet now. Air pollution has spread itself from the surface to the edge of space and from pole to pole. Water pollution covers the planets waters as well. The pH of the oceans are moving to more acidic. The "pristine" definition is now changed to just the least polluted.
_________________ With friends like Guido, you will not have enemies for long.
“Intellect is invisible to the man who has none” Arthur Schopenhauer
"The difference between genius and stupidity is that genius has its limits." Albert Einstein
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