im talking about the particles you cant even see filter floss will not stop something as small as those fine particles going to the impellor
By that theory anyone with sand in there tanks should have filters breaking left right and centre. I think you're being overly cautious here and maybe just got burned by a dodgey filter?
I've seen enough people with sand bottomed freshly done tanks that haven't had a single issue so long as they used plenty of filter floss before the sand could get to the impellor.