Review on AQQA 6-in-1 Electric Aquarium Gravel Cleaner and Vacuum - Automatic Fish Tank Cleaning Tools, suitable for Water Change, Sand Washing, Filter Maintenance, and Circulation (320GPH, 20W) by Leisa Norman

This unit works well after modification. The sand nozzle clogged too easily, so removing the filter and drilling out the inner screen solved the problem. I then made a bucket filter with enough surface area to catch the debris pulled from the sand. Use a 5-gallon bucket with a 2-inch hole in the bottom and set out a calendar with a grid to catch 1-year-old debris in the sand. The scraper attachment worked great on the glass, as did the stone cleaning brush.