I would suspect it is not rated for salt water. I looked at their site and they're all koi ponds and fountains.
I would do this: go to PetSmart or other source and get several Penn-plax battery/regular bubbler pumps. These are useful in a blackout, run on regular batteries or on house current. This will keep tank and sump from going toxic. As an alternative ANY old air pump will do. Then get online and order a proper pump with a next-day air delivery: what you'll save in not buying the Total probably will pay for airship. Remember this is Labor Day weekend, so there will be no regular mail on Monday.
I don't know where you are, but look at the bottom of the FORUMS listings (use blue tabs in page banner) and see if there is a local reef club. SOmetimes members have spare gear they'll lend. Plus advice and help.