Water Filtration & Treatment

Hard water is water with high dissolved calcium and magnesium. The 'hardness' is measured in grains per gallon (gpg) — under 3 gpg is soft, 3–7 gpg is moderately hard, 7–10 gpg is hard, and 10+ gpg is very hard. Most North Idaho wells run 10–25 gpg. The mineral itself is not unhealthy, but it scales every appliance it touches: water heaters lose 5–10% efficiency per year of scaling, dishwashers leave spots, faucets crust over, and tankless water heaters fail prematurely without descaling.

Hardness is solved with a water softener — a tank that runs the incoming water through a resin bed loaded with sodium ions, swapping out the calcium and magnesium for sodium. The resin regenerates by flushing with brine from a salt tank (which is what you refill periodically). Modern softeners are demand-initiated (regenerate based on actual water usage, not a timer) and use 75% less salt than older units. Salt-free 'conditioners' exist as a marketing category but they do not actually remove hardness — they bind it temporarily so it scales less aggressively, which is sometimes enough and sometimes not.

Iron in water above 0.3 ppm causes orange staining on laundry, sinks, tubs, and toilets. Manganese above 0.05 ppm causes black staining and a metallic or astringent taste. Both are extremely common in North Idaho wells — the soil here is iron-rich, and the water table picks it up on the way through. Iron also feeds iron bacteria, which form slimy reddish-brown buildup in toilet tanks and supply lines.

Removing iron and manganese is more involved than removing hardness. The right equipment depends on the form: ferrous (clear-water) iron, ferric (red-water) iron, and bacterial iron all require different filters. Light iron (under 1 ppm) is sometimes handled by a water softener. Higher concentrations need an air-injection oxidizing filter or a chemical-injection system that converts the iron and manganese to a precipitate which is then filtered out. We pick the system based on the lab test, not by guessing.

Hydrogen sulfide is a dissolved gas that produces the unmistakable rotten-egg smell — sometimes only at the hot tap (which means it is forming inside the water heater, often on a magnesium anode rod) and sometimes throughout the home (which means it is in the well itself). It is not directly harmful at typical residential concentrations, but it tarnishes silver, corrodes copper, and is unpleasant enough that nobody wants to drink the water.

Solution depends on source. Hot-tap-only smell is usually fixed by swapping the magnesium anode rod for an aluminum or powered anode rod — a single service-call fix. Whole-house sulfur smell requires either a chlorine-injection system that oxidizes the H2S followed by a carbon filter to remove the chlorine residual, or an air-injection oxidizing filter that operates without chemicals. We pick based on concentration and well chemistry.

Bacteria, viruses, nitrates, and other biological contaminants are the highest-stakes part of well-water testing. Coliform bacteria show up in roughly 30% of North Idaho private wells over a 5-year period — usually due to surface water infiltration through a damaged casing or wellhead. Nitrates above 10 ppm are a regulated health hazard especially for infants. Both are fixable, but the fix depends on whether the contamination is constant or intermittent.

UV purification is the standard ongoing solution for bacterial contamination — a UV bulb in a stainless chamber that the entire incoming water flow passes through, which kills bacteria and viruses without adding chemicals. UV requires a sediment pre-filter to keep the bulb's view clear. For nitrates, the answer is reverse osmosis at the kitchen tap (point-of-use) for drinking water, or a whole-home anion exchange unit (point-of-entry) for higher concentrations. We always recommend a follow-up bacterial test 30 days after UV install to confirm the problem is solved.

Sediment is fine sand, silt, or rust particles in the supply that clog aerators and shorten the life of every appliance downstream. Tannins are organic compounds (decayed leaves, peat) that turn water yellow-brown and taste musty; they are common in shallow wells near surface water. Chlorine taste/smell shows up on city water (Sandpoint, Ponderay, CDA, Hayden, Post Falls all chlorinate). Total dissolved solids (TDS) is the catch-all measure of how much non-water stuff is in your water.

These issues are handled by the simpler end of our toolkit: spin-down sediment filters at the well head, large-format cartridge filters, tannin-specific anion-exchange units, and whole-house carbon filters for chlorine and taste. Often a single multi-stage cartridge housing handles three of these in series — quoted as a package after we see the lab results.