The Water overflows onto the ground from the drian hose that goes into the wall during the rinse ....

As long as the drain hose is hanging properly in the drain line in the wall, it should drain properly. Washers are designed not to exceed the capacity of the standard household drain line. Therefore, as is nearly always the case, your drain line is probably a little bit slow. You might try using a drain clearing device that connects to your garden hose. They do an excellent job of clearing partial blockages. Drain cleaning fluids and snakes just are as good with that type of problem.

Yes, you may try to use drain cleaner. But, after you do this, be sure to go to the store and purchase some yeast and flush it down the toilet. A septic system relies on bacteria to break down the solid waste to avoid clogging up your system. the Drain cleaner destroys the bacteria growing process, but the yeast will kick start it. Also, Make sure your vent pipe is clear, if you have an obstruction in your vent pipe, this may slow drainage, aswell as create a huge fire hazard in your house from sewer gass build up.