Loading...
Loading...
Water Treatment Glossary
A comprehensive reference guide to water treatment terminology — from activated carbon to water table. Plain language explanations for every term.
A highly porous form of carbon used in water filtration to adsorb chlorine, chloramines, volatile organic compounds (VOCs), bad tastes, and odors. Available in granular (GAC) and block (carbon block) forms. Catalytic carbon is an enhanced version with greater surface area and reactivity, particularly effective against chloramine.
A regeneration step in media-based filtration systems where water flow is reversed through the filter bed to flush out trapped sediment and debris. Backwashing expands the media bed, removes accumulated particulates, and restores the filter to full capacity. Most whole-house filtration systems perform an automatic timed backwash cycle, typically at night.
A highly concentrated salt solution (sodium chloride or potassium chloride in water) used to regenerate ion-exchange resin in a water softener. During regeneration, the brine solution flushes through the resin tank, displacing accumulated calcium and magnesium ions and restoring the resin's exchange capacity. The spent brine is then rinsed to drain.
A naturally occurring mineral form of calcium carbonate (CaCO₃) used as filtration media in acid neutralizer systems. As acidic water passes through a calcite bed, the calcium carbonate dissolves slightly, raising the pH toward neutral (7.0). Calcite is a self-regulating, naturally replenishable media commonly used for treating low-pH well water in Florida.
A disinfectant formed by combining chlorine with ammonia, used by some Florida municipal water utilities as an alternative to free chlorine. Chloramines are more stable than free chlorine, persist longer in distribution systems, and produce fewer regulated disinfection byproducts. However, they require catalytic carbon (rather than standard activated carbon) for effective removal, and they are harmful to fish and dialysis patients.
A group of bacteria used as indicators of water quality and potential fecal contamination. Total coliform bacteria are broadly distributed in the environment; fecal coliform (particularly E. coli) indicate direct sewage or animal waste contamination. The EPA requires that drinking water contain zero detectable coliform bacteria per 100 mL sample. Any positive result requires immediate investigation and treatment.
A measurement of water's ability to conduct electrical current, expressed in microsiemens per centimeter (µS/cm). Conductivity is directly proportional to the concentration of dissolved ions in water — higher conductivity indicates more dissolved minerals and salts. Often used as a proxy measurement for TDS (Total Dissolved Solids). Pure water has very low conductivity; seawater and mineral-rich well water have very high conductivity.
A water treatment process that removes virtually all ions (both cations and anions) from water using specialized ion-exchange resins. DI water has extremely low TDS, often near 0 ppm, and is used in laboratory, pharmaceutical, electronics manufacturing, and specialty industrial applications. Unlike reverse osmosis, DI does not remove bacteria or pyrogens.
The process of removing dissolved salts and minerals from seawater or brackish water to produce fresh potable water. Most commonly achieved through reverse osmosis (RO) membranes or thermal distillation. Desalination is increasingly important in coastal Florida communities where saltwater intrusion affects freshwater aquifers. Commercial-scale desalination systems are among the specialized solutions we engineer.
The process of passing water through a porous medium or membrane to remove suspended particles, sediment, microorganisms, or dissolved contaminants. Filtration can be mechanical (physical size exclusion), adsorptive (carbon), biological, or chemical. The term encompasses a broad range of technologies from simple sediment filters to complex multi-stage systems incorporating multiple filtration mechanisms.
The standard unit of measurement for water hardness in the United States. One grain per gallon equals 17.1 mg/L (ppm) of calcium carbonate equivalent. Water hardness classifications: 0–1 gpg (soft), 1–7 gpg (slightly to moderately hard), 7–10 gpg (hard), 10+ gpg (very hard). Sarasota County municipal water typically measures 15–25 gpg — well into the "very hard" category.
A measure of the concentration of dissolved calcium and magnesium ions in water, expressed in grains per gallon (gpg) or milligrams per liter (mg/L). Hard water results from water passing through limestone and other mineral-rich geological formations — exactly the conditions present in Florida's Floridan Aquifer. Hard water causes scale buildup in pipes and appliances, reduces soap effectiveness, and contributes to dry skin and hair.
A colorless, toxic gas dissolved in some groundwater that produces the characteristic rotten egg odor. In Florida well water, hydrogen sulfide is generated by sulfate-reducing bacteria that thrive in anaerobic (oxygen-poor) deep aquifer environments. Even very low concentrations (0.05 mg/L) are detectable by smell. Treatment depends on concentration: aeration for low levels, oxidation filtration for moderate levels, chlorination for high concentrations.
A chemical process in which ions in solution are exchanged with ions of similar charge attached to an insoluble resin matrix. In water softening, calcium (Ca²⁺) and magnesium (Mg²⁺) ions in hard water are exchanged for sodium (Na⁺) ions on the resin beads. The resin is periodically regenerated with a brine solution that restores its sodium charge. Ion exchange is the fundamental mechanism in traditional water softeners.
Kinetic Degradation Fluxion — a high-purity copper-zinc granular alloy that reduces chlorine, heavy metals (lead, mercury, cadmium), hydrogen sulfide, and certain bacteria through redox (oxidation-reduction) reactions. KDF media is often used alongside activated carbon in whole-house filtration to extend carbon life and address contaminants carbon cannot handle alone. KDF does not remove hardness minerals.
A semi-permeable barrier that allows water molecules to pass while rejecting dissolved contaminants, ions, and larger molecules. RO membranes are thin-film composite (TFC) materials rated by their rejection percentage for various contaminants and their production rate in gallons per day (GPD). Membrane performance degrades over time as fouling occurs; most RO membranes should be replaced every 2–3 years.
A unit of measurement equal to one millionth of a meter (0.001 mm), used to rate the pore size of filter media and membranes. A smaller micron rating indicates finer filtration: 50 micron (coarse sediment), 20 micron, 5 micron (general pre-filtration), 1 micron (fine sediment, some bacteria), 0.1 micron (most bacteria), 0.0001 micron (RO membrane — removes dissolved contaminants). Human hair is approximately 70 microns in diameter.
Certification by NSF International (formerly the National Sanitation Foundation) verifying that water treatment products meet established health and safety standards. Key NSF standards for water treatment: NSF/ANSI 42 (aesthetic effects: chlorine, taste, odor), NSF/ANSI 53 (health effects: lead, cysts, volatile organics), NSF/ANSI 58 (reverse osmosis systems), NSF/ANSI 61 (drinking water system components), NSF/ANSI 62 (distillation). Always look for NSF certification when evaluating any water treatment product.
The natural movement of water molecules across a semi-permeable membrane from a solution of lower solute concentration to one of higher solute concentration, until equilibrium is reached. This is the biological process that plants use to draw water through their roots. Reverse osmosis (RO) applies external pressure to force water to move in the opposite direction — from high-concentration to low-concentration — against its natural osmotic gradient.
A logarithmic scale measuring the concentration of hydrogen ions in water, ranging from 0 (extremely acidic) to 14 (extremely alkaline), with 7.0 being neutral. The EPA secondary standard for drinking water pH is 6.5–8.5. Florida well water frequently falls below 6.5 (acidic) due to decomposing organic matter and geological factors. Acidic water corrodes copper pipes, causing pinhole leaks and blue-green stains at fixtures.
Per- and polyfluoroalkyl substances — a group of thousands of synthetic chemicals that do not break down in the environment or human body, earning the name "forever chemicals." PFAS are linked to cancer, thyroid disruption, immune system effects, and developmental issues. They enter water supplies from military base fire-fighting foam, industrial discharge, and agricultural runoff. Florida has several PFAS-contaminated water sources. Reverse osmosis is currently the most effective point-of-use treatment.
A unit of concentration equivalent to milligrams per liter (mg/L) in water chemistry. One ppm means one milligram of a substance dissolved in one liter of water. TDS is typically measured in ppm; chlorine, iron, and other contaminants are reported in mg/L. The EPA maximum contaminant level (MCL) for lead, for example, is 0.015 mg/L (15 ppb — parts per billion). Context matters: 1 ppm iron causes significant staining; 1 ppm lead is an extreme health hazard.
The process of restoring an ion-exchange resin's capacity by flushing it with a concentrated brine solution. During regeneration, sodium ions in the brine displace the accumulated calcium and magnesium ions on the resin beads, flushing them to drain. After rinsing, the resin is fully recharged with sodium ions and ready for another service cycle. Demand-initiated regeneration (DIR) systems regenerate based on actual water usage rather than a fixed timer, using significantly less salt.
Small polymer beads (typically 0.3–1.2 mm diameter) with functional groups that exchange ions with passing water. In a water softener, the resin beads are cross-linked polystyrene sulfonate charged with sodium ions. High-quality resin is durable and should last 10–15 years under normal use. Fine mesh resin is used for high-iron applications. Resin performance degrades if exposed to oxidants (chlorine, iron in high concentrations), requiring eventual replacement.
A water purification technology that uses hydraulic pressure to force water through a semi-permeable membrane with pores approximately 0.0001 microns — small enough to reject dissolved salts, heavy metals, bacteria, viruses, PFAS, nitrates, and most other contaminants. A standard under-sink 5-stage RO system rejects 95–99% of most dissolved contaminants. RO produces a small volume of reject water (concentrate) that carries the removed contaminants to drain.
Hard mineral deposits — primarily calcium carbonate and magnesium carbonate — that form on heated surfaces and inside pipes as hard water evaporates or is heated. Scale dramatically reduces the efficiency of water heaters (a 1/4-inch scale layer reduces efficiency by up to 40%), clogs showerheads and aerators, damages appliances, and restricts pipe flow over time. Scale buildup is the most common and costly consequence of untreated hard water in Florida homes.
Particulate matter suspended in water including sand, silt, clay, rust particles, organic matter, and other solid materials. Sediment causes water to appear cloudy or turbid and can clog aerators, showerheads, and appliance inlet screens. Larger sediment (50+ micron) is removed by spin-down or wound sediment pre-filters. Fine sediment (1–5 micron) requires higher-quality cartridge filters. Sediment can harbor bacteria and interfere with UV sterilization if not adequately removed.
A water treatment device that reduces water hardness by removing calcium and magnesium ions through ion exchange, replacing them with sodium or potassium ions. Softened water produces better lather with soap, prevents scale buildup in pipes and appliances, and improves skin and hair feel. Salt-based softeners use a brine regeneration cycle; salt-free conditioners (like our Naturwise system) use template-assisted crystallization (TAC) to change mineral structure without removing them.
A measure of all inorganic and organic substances dissolved in water, expressed in mg/L (ppm). TDS includes minerals (calcium, magnesium, sodium, potassium), metals (iron, lead, copper), salts, and organic compounds. Higher TDS often correlates with harder water and more pronounced mineral taste. The EPA secondary standard (non-enforceable, aesthetic) is 500 mg/L. TDS is measured with a simple conductivity meter and is a quick indicator of overall water mineralization.
The technology used in salt-free water conditioners (such as our Naturwise system) that converts dissolved calcium and magnesium ions into microscopic crystals that cannot bind to surfaces. Unlike ion exchange, TAC does not remove hardness minerals — they remain in the water but cannot form scale. TAC systems require no salt, no electricity, no drain connection, and have essentially no moving parts, making them extremely low maintenance.
A measure of the cloudiness or haziness of water caused by suspended particles, expressed in NTU (Nephelometric Turbidity Units). High turbidity can indicate sediment intrusion, algal growth, or disruption of source water. The EPA maximum contaminant level for turbidity in treated municipal water is 1 NTU; many utilities target below 0.3 NTU. High turbidity interferes with UV sterilization by shielding microorganisms from UV exposure, making pre-filtration critical.
A disinfection method that exposes water to ultraviolet light at a specific wavelength (typically 254 nm) that damages the DNA and RNA of microorganisms, rendering them unable to reproduce. UV sterilization is effective against bacteria, viruses, and protozoa (including Giardia and Cryptosporidium, which are resistant to chlorine) at a dosage of 40 mJ/cm² or higher. UV adds no chemicals to water and produces no disinfection byproducts. It requires clear, pre-filtered water to be effective.
The upper boundary of the saturated zone in soil and rock where all pore spaces are filled with groundwater. In Southwest Florida, the shallow water table aquifer sits close to the surface — often within 5–15 feet in many areas. This proximity makes shallow wells vulnerable to surface contamination from flooding, agricultural runoff, and septic systems. Deeper wells penetrate the Floridan Aquifer System, which while more protected, contains higher mineral concentrations including calcium, magnesium, and hydrogen sulfide.
Our team is happy to explain anything about your water chemistry or treatment options — for free.