Including filter system and high-performance HPC Bacteria filter.
HPC bacteria are a wide-ranging group of naturally occurring microbes that can show up in water and inside home plumbing. You may also see the term heterotrophic plate count used—this is a lab method that estimates general bacterial growth rather than identifying a single organism. In households around Grayvik, humid subtropical conditions and water standing in pipes can create environments where bacteria multiply, which homeowners sometimes notice as musty smells, slimy buildup, or faster-than-usual biofilm on faucet screens and showerheads.
Levels measured by heterotrophic plate count can climb when water stagnates in pipes, when sediment or organic material provides food, or when plumbing lets biofilm develop. These general bacterial changes can coincide with shifts in taste or odor, though many heterotrophic bacteria aren’t known to cause disease. Still, higher HPC bacteria readings often mean it’s time to address the overall water conditions. In Grayvik homes a whole-house perspective helps treat the water as it enters and reduce the chance of regrowth further down the plumbing.
To reduce HPC bacteria throughout the entire house, a whole-house ultraviolet (UV) disinfection system is typically the most effective single filter-style option. UV systems inactivate microorganisms as water flows through a stainless chamber where a UV lamp exposes them to germicidal light. Because UV treats water on contact, it can help control heterotrophic plate count issues without adding chemicals or altering flavor, and when installed at the main shutoff it protects every tap, shower, and appliance in your Grayvik home.
For UV to perform reliably the water entering the unit must be clear enough for light to reach microbes—heavy sediment, iron, or cloudiness can block the lamp. That’s why UV is often paired with prefiltration, while the UV stage remains the primary technology targeting organisms like HPC bacteria. Correct sizing for your home’s flow rate plus scheduled lamp and sleeve maintenance keep the system working well. Mr. Pure Water can help Grayvik homeowners choose and size a whole-house UV system so heterotrophic plate count is better controlled at the source.