A couple of questions. Do you have a new washer? Has the drain worked OK in the past? What size is the standpipe? Newer washers empty water much faster than older models. Older standpipes and traps were commonly 1-1/2" diameter pipes. These are too small for the newer machines, so backups are common. New standpipes and traps should be 2" diameter. If the drain worked OK in the past and no changes to the machine have been made, your drain may be partly clogged. Forget about bladders, chemicals, and DIY hand snakes. You need a professional to properly auger the drain and totally clear the clog.