Including filter system and high-performance Coliform Bacteria filter.
Coliform bacteria are a group of microbes commonly used to assess how well water has been protected. In Marathon, a positive coliform result—sometimes listed as total coliforms—can mean untreated water is entering your system through a compromised well, a plumbing cross-connection, or other intrusion. Because these bacteria often don’t change taste or smell, lab testing is the way to know if there’s an issue that needs attention.
When total coliforms show up in Florida testing, typical next steps include re-sampling, finding and fixing likely entry points, and installing a whole-house barrier for ongoing peace of mind. Total coliforms aren’t the same as E. coli, but their presence can indicate conditions that might allow other microbes to appear. Many Marathon homeowners choose treatment at the point where water enters the house so that every tap—from Key Colony Beach to Coco Plum—stays protected.
For treating coliform bacteria in a whole home, a point-of-entry UV disinfection system is usually the single most effective filter. Ultraviolet light inactivates microbes as water flows through the chamber, delivering full-house coverage without adding chemicals. Sized correctly for your home’s peak flow, a UV unit can give reliable protection at every faucet in Marathon whether your water comes from the municipal system or a private well.
UV systems work best when water is relatively clear, because sediment can shield bacteria from the light; in the Keys’ humid, coastal environment with moderate hardness and occasional storm-driven debris, many homeowners pair UV with a prefilter. If your primary concern is total coliforms, UV is the proven option; Mr. Pure Water can size and install the right unit for your plumbing and peak demand and provide routine lamp and sleeve service to keep treatment consistent across your Marathon property.