I have this unit and I run it on my fw
tank every couple of weeks for approximately 10-12 hours. I run it on my sw
tank every month for a few hours just to "polish" up the water.
I don't believe you would be able to run on a continual basis, as it is mainly designed to polish water and remove any small particles. After 10-12 hours the filter media (diatomaceous earth - a very fine powder) becomes clogged. If you wanted to run it continuously, you'd have to change the filter media a couple of times a day.