Both the Big Green and Big Green PowerBrush use the same proportions of solution and water. You will find a measuring cup that pulls out on the side of the machine. The opening where the measuring cup is stored is the same opening where you fill the machine with the clean water and solution. Use the measuring cup, which is approximately 10 ounces, to add your BISSELL formula and then add 2 gallons of warm clean water. You will know the canister is full when the water level reaches the bottom of the three vertical lines inside the clean water/solution chamber.
The User's Guide for this machine is available online free of charge. Please follow these directions to obtain it: Go to the BISSELL Homepage, http://www.bissell.com and select "Customer Service" from the navigation bar on the top of the homepage. Next, choose "User Guide" from the drop down menu. Locate your machine and click on it to download, view, or print the User's Guide. You may also use the link below to arrive at the User's Guide list: http://www.bissell.com/Products/UserGuides.asp
If the User's Guide is only available in .pdf format, you will need to have Adobe Acrobat Reader in order to view and print it. If you do not have Adobe Acrobat Reader, you can download it free of charge by selecting the yellow Adobe Acrobat box on the left menu. If you would like a copy of the User's Guide mailed to you, please contact BISSELL Consumer Services at 1-800-263-2535, Monday - Friday 8 a.m. to 10 p.m., or Saturday 9 a.m. to 8 p.m., ET. The cost for a User's Guide is approximately $6.00 including shipping and handling.