Well, that particular one isn't that big... only about 1000 gph.
Personally, I'm not sure I'd want to put a 15 lb pump with an aluminum housing in the sump of my saltwater system. One thing to note that is important -- according to the
specs on the HD website, it has a maximum operating temperature of only 77*F (but it does also say it has a minimum operating temperature of 77*F, so who knows how accurate that is). The majority of saltwater tanks are run warmer than that.