From online research minimum you need a 0.2 micron filtration to filter bacteria. Based on online reviews and research the 3 popular brands

1) Aquaphor - Crystal Eco (RM 1500)
2) 3M - DWS 2500 (Estimated RM 2600-2900)
3) Amway - Espring (Estimated RM 3k+)

aquaphor is RO water? doesnt seem so from the tech

I'm merely stating the facts that electrical appliances are more prone to failure than non electrical appliance.
This is the burnt monitoring module (the electronic board) of our espring due to power surge.
[attachmentid=9427189]
Total cost to replaced the monitoring module is RM629.65
The conclusion is, it's good to have those monitoring features and UV, but the cons is, it is prone to power surge damage and replacement cost ain't cheap. For those who are using espring now, please protect your espring with surge protector/isolator.

Background:
This was a preliminary study to test for the presence of multiple antibiotic-resistant extended spectrum β-lactamase (ESBL) producing bacteria in Malaysian urban surface waters. Although the literature review revealed several published papers on clinical ESBL isolates in Malaysia, none were found on ESBL isolates obtained from local surface waters

Materials and Methods
The four sampling sites selected within the city of Petaling Jaya were one site along Sungai Kayu Ara (3.112086N,461.596438E), two sites along Sungai Pencala and one site at a large drain running perpendicular to Jalan Lagoon Selatan (3.06454N,461.598756E). One of the two sites along Sungai Pencala (3.095823N,461.633946E) was exposed to a more industrialised environment. This area had many factories and companies such as motor showrooms, car rental companies, food manufacturers and a free trade zone. Drains and pipes from these industries open into the river. The other site along Sungai Pencala (3.120217N,461.627487E) was relatively less industrialised, although it did run close to the main road. Sungai Kayu Ara’s sample site was in a more residential area, with condominiums and houses in the surrounding area. However, one of the banks was badly maintained and had domestic waste dumped along it. Sampling was carried out early in the day on different days, ensuring that there was no rain prior to sample collection.


Conclusion
It is evident from this study that local urban surface waters are contaminated with potentially pathogenic ESBL-producing bacteria, possibly originating from domestic and hospital waste, farming, and agriculture. The presence of ESBL in the environment poses potential risks of outbreaks of infection in the event of human exposure and highlights the need to be prepared for such circumstances in terms of funding and healthcare. In addition, the results show the importance of effectively controlling the release of contaminants into local surface waters. The findings of this preliminary study may form the basis for future work on Malaysian surface waters