You'll need to consider many factors when deciding on the types of filters and the best treatment for you, depending on what you're looking for. Perhaps, if you're looking for clear water that's also free of impurities such as nitrates, pesticide and herbicide chemicals, and bacteria, a reverse osmosis water filter is the best, most thorough purification option for you. But RO ultrafiltration products are also the most expensive, so if your well only really has a tannin issue, or you just want to get rid of brown/yellow water, you might want to consider a water softener with an ion exchange resin or an oxidizing filtration unit. These products tend to be better for smaller budgets while still being considered highly effective at tannin removal.