Sure he would.
I use some NSW and if I lived just a little closer to the beach I would use nothing but NSW. It is by design better than fake seawater because it is, well it is, "real" sea water. My tank was started with NSW in 1971, as fake seawater was not invented yet. (If Randy had a fish tank then, he would have invented it)
Actually the guy who invented STP for cars was a fish Geek and he invented Instant Ocean.
Anyway to prepare for NSW I first roll up my pants, then I wade out here with a bucket making sure no pretty girls are looking because you don't want to appear to be a Geek, even though we are.
Then you carefully lower the bucket into the water.
That's it. Then before it warms up I strain it through a coffee filter, T shirt or towel to get rid of the tiny jellyfish or Loch Ness Monster fry. After it warms I test the salt because here in NY it is weak. I don't know why but it is.
I use my 20 year old swing arm hydrometer but you can go to a lab and use one of their $5,000.00 hydrometers if that makes you happy. Then dump the water in your tank and go out to dinner and have a nice glass of Merlot knowing your fish are happy :bum: