I dunno if ive ever seen velcro, not a bad idea except wouldnt the screen be kinda spendy?
those little strips you buy are like 10 bucks all by themselves. Super rough though
Ive seen some people making thiers out of legos on the turf scrubber site.
I like posiedens idea if there were a way to make that tile rough enough. the reason ebing is that if its a cement type tile supposedly cement has alot of phospahte in it so it grows algae really well.
I beleive the old time scrubbers were made of cement and some of the new comercial ones are too. the old ones never fqactored in a need to clean or a way to clean. so failure was immenent they just didn't know it at the time.