Point-of-use system under the sink
This method of filtration involves attaching a filter system directly under the sink. The benefit of this is that there is generally a larger amount of space afforded for a more complex set up, with no need to clog up precious counter space. Aquasana has under-the-sink filters that meet NSF 42, 53, 401, or even 473 standards, which means it can remove parasites, chlorine, organic compounds, lead, and perfluoroalkyl substances. Doulton also has a model featuring a four-step process using a ceramic filter, activated carbon, and ion exchange to sift out parasites, chlorine, volatile organic compounds, and lead.
The downside of these systems is that you can’t usually install it yourself, but luckily, a company like Life Solutions offers comprehensive services which include supplying the filters, installation, and maintenance by their in-house technicians. Their consultation services are arguably the best available in Hong Kong, and they also offer a free water test so you can determine which kind of filtration system would suit the needs of your household best.