Review on Studor 20297 Maxi Filtra Admittance Valve by Joshua Mejia

I added this to my sump pit's jackal anti-radon coating. I was advised by a local plumbing supplier that it could be added to get rid of the stale water smell I get from the swamp. I don't feel like it did much to help get rid of the smell. I know this is for roof vents, but in theory it should work for what I'm using it for. It also consists of a simple PVC construction and is significantly more expensive for this construction. But all of these things work in the same price range, regardless of the manufacturer. And to be honest, this one was way cheaper than the competition. Although I would have expected better performance for the price.