Water Treatment Unit

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Hello all
Does anyone know how long the Self Sanitizing water treatment unit from Pure
Water Enterprises last? It is sealed so no filters can be changed. To me this
either means the unit may last forever (which I doubt) or the unit needs to be
replaced after a predetermined amount of time.If it needs to be replaced does
anyone have any suggestions as to what unit to purchase.

Thank you

Robert & Dianne
1987 FC35