In 2013, while working freelance for a Boston-area design firm, I worked on an under-faucet-mounted filter system for a well-known water products company.
The challenge here was to take existing filter parts and modify them for a new interaction in a new industrial design. The fluid flow feature size and shape needed to be optimized for performance, while still fitting inside a design the client really liked. Beyond that, this had to be accomplished with a minimum number of parts, concealed and minimal seams, and a small electronics package and button underneath. I have one, but just for decoration. It turned out really well, I think.
You can buy it here. I don’t get any money from this.