Hello I recently myself repiped my whole house in copper and installed a new pressure tank, 3 stage cartridge filter, iron reducing well filter, and softener. The filters backwash to my sump pit, which in turn discharges out the side of the house and to a drainage ditch at the road. I have a strong rotten egg/sewer smell coming from my sump pit that I assume is from the backwash (when I agitate the bottom of the pit with hose water the smell is horrendous). In Chicago and the ground freezes so trying to find a solution that doesn’t involve drilling through my foundation below the frost line and installing a French drain and/or tying to the drainage ditch? Can I cap the sump pit and vent it somehow? Is there maybe a way to tie a radon ejector fan to a capped sump pit and kill two birds one stone? side note, the membrane filter is only 3 months old so idk if too much rust/sulphur and I should shock the well? Rookie/greenhorn here with very basically no plumbing background..