The filters used in your WaterFed system are the most important components for pure water production. The filters at the beginning of the purification process tend to be the cheaper filters and will protect your more expensive filters. Frequently replacing them helps to avoid expensive repair costs and to keep your Total Dissolved Solids (TDS) at an optimum, low level. White spots on the glass after you have completed the job are good signs that your filter(s) need to be replaced. Below we have broken down what type of filter is needed for each individual pure water system. Click on each to learn more and purchase replacement filters.