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Last time I tried one of those power plungers in a toilet it was horrible. The block was too much and the pressure blasted back up blasting shit...

Pour about a cup of dish soap in the bowl and flush. Wait a few hours or overnight, then, pour a gallon of boiling water in and flush. You may...

Only option you really have, is a toilet auger. I definitely wouldn't recommend using a whole bunch of chemicals since you have a septic system...