I looked it up and it does not say how big of a tank it handles. I never liked all in one filters for saltwater. For the 200+ $ I would rather invest into a skimmer. Looks like it would do an ok job on a tank smaller than a 30g or so with a light bio load. If you plan on upgrading to a large tank one day, don't waste your money on this and buy each part of your filtration individualy. I have a garage full of old equipment I wish I would have never wasted my money on.
Just my 2 cents.