I just have to say I LOVE this product.
I add it to my laundry EVERY day. I have also made my old laundry detergent with it. You can see my recipe here.
If I am not using it in my own soap (normally when I get laundry soap really cheap with a coupon) I still add borax to the water. I prefer to start the water running in my machine and then add the borax. I let the machine agitate for a few minutes / seconds before adding my clothes. I have had the best results this way. The powder gets mixed into the water and dissolves nicely.
Check out their promotions page here where you can sign up to receive their newsletter and coupons. (Who doesn't like coupons).
Just in case you have never used Borax here's a few facts.
20 Mule Team Borax is 100% natural mineral from the earth.
Borax is the common name for sodium tetraborate: produced by the perpetual evaporation of seasonal lakes
Absolutely nothing is added. No phosphates, chlorine, or other additive chemicals
Now you can have a chance to win a coupon for a free box of 20 Mule Team Borax.