I want to hook up a basement-level washing machine drain directly into the main sewer pipe leading from the house, which is about 7 feet up off the basement floor, but the water pressure coming from the drainpipe coming out of the washing machine can't compete with the force of the water coming from upstairs pouring down through the big sewer pipe drain on its way to the septic tank when someone flushes a toilet or is taking a shower, and sewer water backwashes through the opening where the pipe from the washing machine connects to the big sewer pipe, flooding the basement floor. Is there another way to hook the drain pipe coming from the washing machine, maybe some kind of valve so the water can only go one way?