Sweetfilters eliminate sewer gas odors overnight.

: I installed a new septic system a year ago. Since then, when the wind blows strong (25MPH or more, say) sewer gas can be smelled in a couple of locations (not all locations) inside the house. I installed a spring-loaded drain vent, where the 1 1/2" vent line connects to the 3" main vent, but the problem remains. What is the key to this puzzle?

• Sweetfilter Septic Odor Eliminator