Product review (4 stars): Again, this does the job for which it was ...
Again, this does the job for which it was intended. This 'treats' the water in the Air-O-Swiss that one puts in from the tap to maintain the condition of the water (think 'hard' water / 'soft' water). Hard water has a high mineral content from percolating through chalk / limestone, etc. It depends on where one lives and where the water they use comes from. This is a silver treatment filter that traps and 'treats' the water to keep the water consistently the same from one fill to the next re-fill.