Theres a couple things you can try one is shocking well and getting chlorine into hotwater tank and leaving it for a night than sending it to waste. The other is how old is hot water tank an has the annoid rod been removed. As far as treatment theres a unit we have at our place called iron breaker it uses no chemicals and does not restrict the well pump. What ever filter you go with you need to make sure you have enough water to wash it alot of these companys will just install it with out checking your flow rate leaving you with a unit that will work great for a while untill it plugs up because its not washing. We got ours from D&S Water Well Service ltd in uxbridge. Hope this helps