I use an aquarium syphon. I have sand about the grain size of granulated sugar. I dig the end into the sand and start the syphon, this pulls all the dirt up out of the sand and some sand with it, when the sand bits are about halfway up the bottom of the tube before it gets into the hose type part I cut it off with my finger. The sand then falls back to the floor and you can start it over again. If you are fully stocked you will find alot of dirt under the sand and also it helps cut down on any dead spots in the sand if you do it once a week.