To rinse the sand in my son's tank I used a water hose and a 5-gallon bucket. I put sand about 1/4 the depth of the bucket, set the bucket on the back deck and tilted it with a piece of 4x4, then turned the water on high and stuck the hose in the bucket to where the end was forcing water deep into the sand. The loose sediment swirled in the water and spilled over the top and onto the ground and the heavier coarse sand sank to the bottom of the bucket. When the water ran clear we put the sand in the tank and started again. We did a 3-inch sand bed in his 75-gallon tank in about 4 hours. No cloudiness, no muss, no fuss.
Why do I love fish? Because every time I stare into the little world I have created for them, every problem I have just floats away....