Your meta declarations seem to indicate an interest in "fresh water generator", but this did not seem to be backed up by the home page text. I speculate it would take little effort to move up from the #10 SERP on Google for this phrase.
You're SERP for "reverse osmosis" looked to be somewhat greater than 150. I suspect that, too, could easily climb with a modest amount of
SEO work. OTOH, if getting more free search engine traffic is not a goal, please ignore
SEO comments :-).
Although the HTML on the homepage contains a DOCTYPE declaration, it isn't one that does much good. See
this article for a discussion.
The reason for using a valid DOCTYPE declaration and the automated error-checking tools it enables becomes clear for this page -- a quick skim immediately turns up a gross HTML error (two closing tags for the
head element).
The text in the top-of-page menu items is nearly illegible when viewed at 1600x1200 by people over 45 (I'm guessing not a lot of teens buy desalinators :-).
The website appears to reuse at least one graphic on multiple pages, but the server does not transmit an HTTP
Expires: that tells client browsers they can safely cache such images.