I have a friend that is trying to sell his house in my town. Holland Ma.
He just got his well water tested. The test came back with a 6.0 nitrate level. He is telling me 5.0 is max in Ma. What do he need to fix this. My local filter suplier says a RO unit should work but very $$$. The guy is just trying to sell the house and be done with it.

I do not know the depth of the well but it is deep. The house is also on septic.

The owner of the house is a friend of mine and lives in Boston now 1.5 hours away.