Yowza, that was pretty scary!
They did a nice job creating lots of tension.
Grossest part, for me, though, was the disgusting crawl space where much of the action happened. Ugh and ick! The film could have simply been called Crawlspace Debris. That's MORE than scary enough for germaphobe me!
Anyhoo, filmed in Serbia (of all places). Who woulda thunk Serbia could substitute for Florida?
No matter. Most of the action was clearly filmed on a set within a soundstage.
If you're into Jaws sorta films, I do think it's worth the bother. For what it is, it's quite good.