The quality of the water and the efficiency of the filtering can only be guaranteed up to a capacity of use equivalent to 6 months.
Our quality parameters for filtering substances exceed 95% in most cases (depending on the type of substance it can be higher, as in the case of chlorine filtering, with 95%).
If you use the refill beyond these 6 months, the efficiency of filtering substances such as pesticides and herbicides, VOCs and heavy metals will no longer meet our quality parameters.
In addition to the aspects mentioned in relation to absorption and efficiency, you must take into account that the components of the refill are of organic origin, so after a long time of use, they can give rise to the proliferation of bacteria.