Super Efficient Sand Generator (+Schematic)

Hi,

PLEASE NOTE THAT THE 1.8 (AND HIGHER) VERSION DOES NOT ALLOW SAND/GRAVEL GENERATING NOW...Yesterday I was making a sand generator for my house and thought I should upload it to Planet Minecraft for you guys to use...

There are 7 sticky pistons on each side making 14 in total. I am planning on making a gigantic version of this in the future 8 long and 8 stories high...

IMPORTANT!!! HOLD THE RIGHT-CLICK MOUSE BUTTON ON THE LEVER.....

..DO NOT RAPIDLY CLICK, JUST HOLD..

..HOLD THE RIGHT-CLICK MOUSE BUTTON, NOT THE LEFT- CLICK..