The mechanical filter very slowly turns collected water into treated water, colonists are only able to fill drinking bottles from this building, it doesn't interact with the pipe network. The building has no electricity requirements, but the mechanical filters lose effectiveness over time and need to be refuelled with Cloth / built at the crafting station at the cost of 1 Component and some Cloth.

Imo would be a great and sensible addition for early game / tribal / medieval runs.