I'd take that interrupting phrase ("either ... scale") and move it to the end of the sentence. Anything that interrupts the main flow of thought in your sentences makes your writing harder to read and follow.
So I could word it..
Nearly every country of the world uses some method of hydroponics, either on a small or large scale.
You can go a long way in proofreading your own papers.
Thanks to PsyDAG for the following:
"After writing your material, put it aside for a day — at least several hours. (This breaks mental sets you might have that keep you from noticing problems.) Then read it aloud as if you were reading someone else's work. (Reading aloud slows down your reading, so you are less likely to skip over problems.)
[You can also either read it aloud to someone else or have someone else read it aloud to you! (The latter works really well!)]
If your reading goes smoothly, that is fine. However, wherever you 'stumble' in your reading, other persons are likely to have a problem in reading your material. Those 'stumbles' indicate areas that need revising.
Once you have made your revisions, repeat the process above. Good papers often require many drafts."
And here are a couple of really good websites that will help, too.
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Yes, your rewording makes the sentence much better.