radon retest 3

https://myradonreductionsystemsite.novacrestiq.com/posts/why-a-radon-reduction-system-matters-for-metro-east-homes

A radon retest is usually done after you've installed a mitigation system to see if it actually lowered the levels. You place the test kit in the same spot for at least two days, then send it off. If the results are still above 4 pCi/L, you'll need to call a pro back. It's just that simple follow-up to make sure your home is safe.