Thank you! I do wc's through the sump and stir it up every time before I siphon, but once a year I take all the rock out and vacuum the sump with a ginormous shop vac that's a PITA to work with. This will make it a lot easier.I use a Bucket-Head from Home depot. It's a little wet-dry vacuum that fits on the top of a 5 gallon bucket. It has a much smaller tube than a regular wet-dry vacuum. Just vacuum all the detritus out of the sump every 6 months or as needed.
http://www.homedepot.com/p/Bucket-Head-5-gal-1-75-Peak-HP-Wet-Dry-Vac-BH0100/202017218
