XQG50-2B Haier Front loading washer. Has a detergent hopper with three (4?)compartments Two appear to be for detergent wash and prewash cycles. the last one has two sections one marked with an A the other with a C. I'm not sure but perhaps substance put in small space marked A will be washed out by water in compartment C. It's an older machine (1998). No manual even in Chinese for us to find out vault@georgeworks.com