Is there also a filter system that I can connect to my existing kitchen faucet?
Yes, the AQA drink Pure filter set can be connected to most existing kitchen faucets. It contains the Magnesium Mineralized Water Filter, which enriches your tap water with the Mineral Magnesium for more taste, and the AQA Monitor, which keeps an eye on the filter capacity. The AQA drink filter cartridge is small and does not take up much space under the sink. It can be installed vertically or horizontally.
However, we recommend using a 3-way fitting (e.g. from Grohe). This allows  only your  drinking water  to be filtered and the capacity of the filter to be used optimally."