Carpet Protectant???

Yeah, scotchguard is really all I hear of around here.  I did check out the Dupont Teflon addvanced and it seems to be a little bit more cost efficient.  If you get a chance check out... http://www.cleancraft.com/Ultre_Guard_Plus_II_Carpet_Protectant_p/ultregdplusii1gal.htm

Well scotchgard is more of a household brand name, and a general term used to describe carpet protectants, than a professional carpet protectant itself. Also, most professionals use a teflon, but the term "teflon" (whom dupont has a registered trademark over) is also only a nickname to describe something that doesnt stick.
There are actually 4 different types of protectants:
1. Colloidal Silica
2. Silicones
3. Fluorochemicals
4. Acid Dye Resistors

Now, most protectnats that professionals use are either a fluorochemical, or an acid dye resistor. The acid dye resistor is basically an upgraded (and more expensive) version of the flurochemical.
Now with all that borning information, who wants to go into a customers house and say "excuse me Mrs. Smith, would you like me to treat your carpet with a flurochemical or acid dye resistors?!"
So instead we ask them if they would like to have their carpets protected, or sctochguarded. At least that's what we do.
We use Dupont Teflon advanced. It does not have acid dye resistors, but if it did we'd have to charge our customers more.
You can find it just by googling "dupont teflon advanced"

Other than scotchguard, what are some of the carpet protecters you guys use?  I would like to stay eco-friendly, but I would also be interested in anything you guys have to throw at me.  Thanks!