Hi there, there is a gauge on a radon remediation system that allows you to moniter the functionality of the system. In many areas of NJ radon is a fact of life. If levels are found to be elevated, then it is expected that the seller will remediate and a retesting is part of that to be sure that the level is acceptable. As far as going to 0 - that is unlikely, but I have seen it come close. Remember this, if you have a radon in the area, you have it in the air outdoors as well. Keep it in perspective.
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