Replaced the male adapter in the pitless to try to resolve leaking pitless. The O-ring is what’s leaking. Well tank advised replacing the pitless adapter. The carbon system will fit. Either a one tank system in the closet or a double tank system and the softener will have to move to the outside of the closet. Also recommend replacing pump. 3/4 hp pulling 7.9 amps. Also discussed a rebed of the arsenic tanks