Pretty much, Its becoming more and more useful, I used it to fill up a rubber maid tub yesterday!
Water changes are much easier / occupy less of my time this way.
I'm building two more as we speak for my LFS.
As far as a patent.. Well Im not looking to make a buck. I doub't it would really take off with main stream users.
I suppose I could make them for other people, but its really easy..
Parts cost is around 30-40 depending on what you already have.
a 12 volt power source, 12 volt NC solenoid (ebay $19), project box or some sort of container, small switch, either a float switch or a cork(wine bottle) and a lever switch (also check ebay)
The world is a tragedy to those who feel, but a comedy to those who think.
Horace Walpole (1717 - 1797)
Nearly all men can stand adversity, but if you want to test a man's character, give him power.
Abraham Lincoln (1809 - 1865)