The Add On Option is not purchased on its own. It is added to the Under Counter Unit for severe or special contamination areas where additional filtration is required. This is a customizable option! Call us to discuss your specific concerns.
 
If you get your water from a well, this is a great option for difficult issues like hydrogen sulfide (rotten egg smell), coliforms like E. coli bacteria etc.. Purchase with the Under Counter unit for additional savings.