Including filter system and high-performance Tannins filter.
Tannins are natural organic compounds that can give water a yellow, amber, or tea-like tint. In Cox, they commonly enter well water as groundwater circulates through decaying leaves, peat, or certain soils. Tannins don’t always change the taste dramatically, but they can produce an earthy or musty flavor and make water look less appealing. Over time they may also cause stubborn staining on sinks, tubs, laundry, and appliances if left untreated.
Because tannins dissolve into the water, they won’t settle like heavier sediment and can pass through simple cartridge filters. Many Cox homeowners first notice tannins when clear glasses look tinted, white clothing picks up a yellow cast, or soap and shampoo don’t rinse away as expected. Tannins can also interact with iron, making discoloration and staining more obvious and trickier to diagnose. The best way to know for sure is a water test, then choose a treatment matched to those results.
For whole-house tannin control, the most effective single-filter option is an anion exchange system made specifically for tannins. These units use a specialized resin that attracts and holds negatively charged organic molecules, removing the color-causing compounds before water reaches faucets and appliances. Compared with standard carbon filters, anion exchange is generally better at removing the dissolved, tea-colored tint tannins produce. When installed at the main water entry to a Cox home, it helps protect plumbing, fixtures, and everyday water use.
An anion exchange tannin filter performs best when paired with proper prefiltration and correctly sized for your household to avoid clogging or channeling. Like a water softener, it requires periodic regeneration to flush out captured organics and restore resin capacity. If your water also has iron, sulfur odors, or sediment, treating those issues alongside tannins will help prevent recurring stains and improve overall clarity. Mr. Pure Water can help Cox homeowners choose the right whole-house configuration based on a water test and your family’s daily demand.