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Just how bad is it leaking? Is it leaking from the bottom area or through the joint between the top and bottom halves? When you look into the tank can you see water flowing out where it shouldn't be? In the septic tanks I have been around, the level of the floating solids only came up about 3/4 of the height of the tank, and stayed at that level as more liquid and solids were added, since the effluent drained from below the floating solids. Most modern tanks have a second chamber that should not have any floating solids and very little muck settled to the bottom. The effluent in the second chamber should be almost clear and as sewage is added to the main tank, more effluent flows into the second chamber and from there flows out to the drainfield. If you have a 2 chamber tank, you should be able to see effluent flowing out from the second chamber when a bunch of liquid is added to the main tank. If it was my situation, I would have the tank pumped ASAP. Since there is some possibility of the empty tank starting to float and coming out of the ground, I would refill it with water as soon as I had looked it over as well as possible looking down the manholes. I would not even consider going into the tank without an air supply and several people outside that could pull me out, using a safety harness and good line. It is terribly dangerous and could kill you.....and they don't call them septic tanks for nothing. As you put the clean water in the tank, you should be able to see where it is leaking. If the leak is at the bottom of the tank, I would try putting a couple of bags of bentonite clay powder in the tank to see if that will seal a crack or hole. If you see that it is leaking from a hole in the caulking of the joint between the top and bottom of the tank, you might want to have a professional fix that. It might be expensive, but probably lots less than $3000 and, probably worth the money considering the danger and ick factor! I heard a guy say onetime that small leaks in a sewer system were more or less self-sealing over time--the solids fill the opening. Hopefully your septic problem will not be too bad. Don't these problems ALWAYS raise their ugly heads in Winter??? Good luck!
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