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Hello, I would call in a septic tank pumping service, or marine waste tank pumping service to pump as much water out as they can, then apply Rid-X to the rest. With good ventilation under the house, you should be OK..
If you have any trouble finding a sewage pumping service, tell me which direction you are from the center of the nearest city and I will be able to locate one for you in most cases.
We can go from here without any time limits.