1) I agree with verything that Gary said, especially about the health issues. Pay an expert to come out and check your system, including a bacteriological analysis of your water.
2) You mentioned a filter before the tank. Beware that some of those in-line cartridge filters need to be exhanged/cleaned regularly. A lot of people don’t realize it, but they make great breeding grounds for bacteria! The only filter I recommend is a UV bactericidal filter, and that needs to be checked regularly, too.