Originally Posted by Jake Larsen
I read somewhere that if you have sand substrate you can put piece of panty hose around the intake tube. This way the sand wont be able to get to the mechanical pieces of the filter. But still at the same time it won't suck all the bigger pieces of stuff that needs to be filtered. Its worth a shot. I'll try to find the article I read and I'll post the link.
Or a piece of sponge. It wouldn't matter what kind of filter it is- they all have impellers, and impellers don't like grit. Make sure you turn the filter off while doing the pwc
and wait for the sand to resettle before firing it up again.