The PFS is very fine, so it doesn't have many cracks or crevices that detritus and waste can fall through and never be found, so just using a hose/gravel cleaner to suck up the waste off the top of the sandbed should be sufficient for cleaning the sand during PWC's. Other than that, you don't really need to touch it and it will still stay very clean.
I'm not very sure how good it is for planted tanks because i didn't use it in a planted tank, but i'm sure it would be fine as long as you put those fert tabs or root tabs in there with it. Not sure what those tabs things are because i've never done a planted tank. Maybe someone else knows? Root tabs, fert tabs? Ah idk.. -_-