Well water system from prior owner
Recently bought a house that the sellers said has well water. Current well water system was installed by a prior owner with whom I have no contact. The most upstream part of the well water system is basically a black box behind an inaccessible brick wall. The well water does feed into what it looks like this tank and pump system (pics one and two) and then immediately downstream this is what it looks like a simple water filter (3rd picture). Downstream of the water filter it meets with where the municipal water feeds into the house. Currently the well water is closed but wondering what is there to know about this current system, is it sufficient to extract the well water, what first steps can we get going to make the water potable, what tests or start up procedures are necessary to get this well water going? We are in the north east United States for reference.