Since moving into our house we've had a nasty, hard to describe not quite sewage smell in and around our house.

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It comes and goes. Seems to be related to cold and/or wet weather though we haven't really tracked that. Late last spring we flushed out the vents with a jet nozzle garden hose and put on a http://www.sweetfilter.com/ it worked beautifully for awhile. Now the smell is back. Do you think I need to have the vents jet cleaned professionally? We had a parade of plumbers out here. We had the sewer pipes camera inspected, nothing. We had the brand new septic re-inspected, nothing, etc. etc. Plumbers had all kinds of suggestions that we followed but none of them mentioned the vents - we KNOW that's what it is. Help!
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