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It's amazing the difference in regulations and codes from state to state. I would think that there'd be more standardization for stuff like this. I was led to believe that (This is from s.e.Michigan, now...) that a 1200 gallon tank is minimum and that would be for two baths/3 bedroom only. Any more of either would require larger tank/field. Well...back to your problem....The more I read your first note, the more I think the problem's in the tank. It would be a good idea to have that tank pumped asap. Verify the floating top pack thickness. And as soon as the level in the tank is lowered, note should be taken of the leech field inlet. If very much effluent charges back into the tank, especially with a 'whoosh', then you have a clogged drain field. That's when you start spending the bucks on either rejuvenation methods or rebuild. One possibility would be to find the ends of the drain field lines and backflush and rinse the lines out. THis is for professionals. They have the equipment and know how to accomplish it with maximum effect. Care must be taken with this, as there's much room for contact with pathogens and bacterias. I doubt that the ground beneath the leech field has been saturated beyond capacity to absorb. Maybe after 20 years of neglect. But yours is still young. But that can be revived, too, without redig and expense of 'new'. There's a lot of science out now on this. Let us know how you fare....
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