Nothing wrong with that.

If you do, it will be MUCH easier if you get the Unicel cartridges, but buy a couple of extra, so you can rotate them. As long as you clean and dry them before putting them up, you can store them indefinitely, to re-use later.

There are some tips out there (maybe even on the forum) about using DE filter powder with cartridges: don't do that. Unicel tells me that it damages the fibers in the filter material.