Including filter system and high-performance HPC Bacteria filter.
HPC bacteria are a wide group of naturally occurring microbes that can live in water and inside plumbing. You may also see them called heterotrophic plate count, which refers to the lab method used to estimate overall bacterial growth rather than a single organism. High readings don’t identify one pathogen but can indicate conditions that let bacteria multiply. In Fidelis homes, this often shows up as musty smells, slimy buildup, or faster biofilm formation on faucets and showerheads.
Levels of heterotrophic plate count can increase when water sits in pipes, when sediment or organic matter is present, or when plumbing encourages biofilm growth. These general bacterial conditions can lead to changes in taste or odor and suggest the home’s water system may need attention. Taking a whole-house approach in Fidelis addresses the water as it enters your property and reduces the factors that allow regrowth downstream.
The most effective single filter-style option for reducing HPC bacteria throughout a house is a whole-house ultraviolet (UV) disinfection system. UV inactivates microorganisms as water flows through a stainless chamber exposed to a UV lamp, treating water in real time without adding chemicals or altering taste. When installed at the point where water enters a Fidelis home, UV provides protection to every tap, shower, and appliance.
For UV to work reliably, the water feeding the unit must be clear enough for the light to penetrate—heavy sediment, iron, or cloudiness can shield microbes. That’s why whole-house UV systems are often paired with prefiltration, while the UV stage remains the primary technology targeting microorganisms like HPC bacteria. Proper sizing to your home’s flow rate and regular lamp and sleeve maintenance keep performance steady; Mr. Pure Water can help Fidelis homeowners select and size a whole-house UV system to better control heterotrophic plate count at the source.