When first installed in 2004, there was excellent service and advice. Pipe opening after two years showed at least no further progression of deposits in the cold water pipes. After the warranty period expired, the system was replaced. Again, there was no reason to find fault with anything. In the meantime, most of the riser and floor supply pipes in the house have been replaced with plastic pipes over the last 10 years. The consumption behavior of the residents has changed towards less consumption. Currently the past 2 years 170 m³/a. However, this is not taken into account in your guaranteed period of use. M.E. the consumption behavior should be taken into account, because the exchange action for which you do not name any labor costs in the offer is not cheap. Whether a benefit is ever created is not provable.
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Translation
Comment from ION Deutschland GmbH: 
Dear customer,
Thank you for your entry!
We are pleased that you are so satisfied, to your comment we would like to inform you that the used systems are replaced in the period of between 5-7 years (depending on water conditions) and these are recycled internally in our production.
I wish you much pleasure with your equipment and would be pleased if you recommend us to others.
With kind regards
Your ION Team