Only the white module with the three white housings have filters inside (only the inside element gets replaced, not the entire housing). Most of the filter waste is simply carbon with very little plastic waste when compared to pressure-bearing inline filters, even if a smaller size. (The black tank is not a filter and never needs replacing or servicing.)
The plastic used in the filters is not separable from the carbon inside and thus is not recyclable. More fossil fuels would be expended in the return shipping to us, also making a recycle program on our side unfeasible.
A typical family generates more unrecyclable plastic waste via food packaging in just a few days than the total plastic wasted in our filters, which are changed only once per year.