Some water treatment suppliers also suggest installing a second treatment device in series for added treatment reliability. This device could be RO or a small amount of activated alumina as described below. If there are any solids in the water, a sediment pre-filter should precede the RO device. There is little maintenance required for RO units. Fluoride and other inorganic minerals will generally not transfer from the boiling chamber to the condensate chamber.
Some organic contaminants can transfer across.
Energy cost and reject heat are some common concerns. Activated Alumina Where much larger volumes of treated water are needed, the treatment process known as activated alumina becomes more cost effective. In this process the well water passes through a bed of activated alumina media. Aluminum from the adsorption media is not given off by this media. Alumina also removes arsenic very effectively.