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[edit] Environmental Issues

Dear writer,

your article was very clear to me, so first of all I would like to thank you for your time and effort you have put in making this article. One remark stays unclear though: "Environmental considerations are making such once through systems increasingly rare." I was wondering if you could explain this a bit more, or mention a reference with more information about environmental issues. Thank you. Tristan Groot 11:10, 23 July 2007 (The Netherlands)

I didn't write that section, but I can answer that question. A typical industrial sized vacuum pump uses fresh water measured in Mega-litres per month, not litres. You can imagine there are fewer and fewer places in the world where a plant can justify pouring megalitres of fresh water down the drain, or even feeding it into downstream process, rather than recirculating and recycling the water. Bernard S. Jansen 05:42, 6 September 2007 (UTC)