Every term we use — TDS, RO, KDF, UV, NSF 58, microplastics, chloramine, hardness — defined in plain English by the team that installs 50+ filters a week in Dubai apartments.
Highly porous charcoal that adsorbs chlorine, taste, odour and organic compounds from water. Used in pre-filter and post-polish stages of RO systems. In Dubai, granular activated carbon (GAC) and carbon-block (CTO) are both standard.
Vitamin-C shower filter that neutralises chlorine via chemical reaction. Effective on paper but exhausts in 400–500 litres, making it expensive in Dubai daily usage.
Reversing water flow through a sediment filter to flush accumulated particles. Self-backwashing sediment cartridges extend filter life.
A mineralisation media used in some 7-stage RO systems to balance pH and restore trace minerals post-RO.
A disinfectant formed when chlorine combines with ammonia. DEWA primarily uses free chlorine, but chloramine traces are possible in older distribution segments.
DEWA's primary disinfectant. Target: 0.3–1.0 mg/L residual at the consumer tap. Removed almost entirely by activated carbon at cold water temperatures.
Colour-change paper strip for home chlorine-level check. Useful for confirming when a shower filter cartridge is exhausted. AED 30 on Noon.
Carbon-block filter — dense, solid-pressed activated carbon that removes chlorine, taste, odour and fine particulate down to 1 µm. Standard pre-filter in 7-stage RO systems.
Dubai Electricity and Water Authority. Manages water production at Jebel Ali desalination plants and distribution across Dubai.
Oxygen dissolved in water, adding freshness and taste. RO slightly reduces it; mineralisation stage partially restores. Affects blind taste-test preferences.
Water with near-zero TDS produced by boiling and condensation. Too demineralised for long-term drinking; RO with a mineraliser is the preferred approach.
Shut-off valve that taps into the cold-water supply to feed the RO system. Allows easy isolation for service.
Mineral naturally present in trace amounts in Dubai desalinated water (0.05–0.2 mg/L). Not artificially added by DEWA. RO removes fluoride almost entirely.
Automatic or manual flush of the RO membrane to extend its life. Typical: 30-second flush after every tank fill.
Granular Activated Carbon. Loose carbon media used in pre-filter stages for chlorine, taste and odour reduction.
Dedicated countertop tap for RO-filtered water, separate from the main kitchen mixer. Food-grade lead-free brass is standard.
Water with high dissolved calcium and magnesium, measured as mg/L CaCO₃. Dubai tap water typically runs 160–320 mg/L CaCO₃ — officially "very hard."
Largest desalination facility in Dubai. Produces ~2.1 billion gallons/day at ~80 mg/L TDS at plant output.
Copper-zinc alloy filter media that removes chlorine electrochemically (not by adsorption). Works at hot-water temperatures, making it ideal for Dubai shower filters.
Plastic fragment smaller than 5 mm. Present in 86–94% of Dubai tap water samples we test, almost entirely from rooftop-tank degradation. RO rejects them completely.
Post-RO cartridge that adds calcium, magnesium and potassium back into the water at bottled-mineral-water levels. Also balances pH to 7.3–7.5.
American National Standards Institute / NSF International certification for residential reverse-osmosis systems. Confirms safe materials and verified contaminant reduction.
The pressure required to drive water through an RO membrane against dissolved-solids gradient. Dubai mains pressure (2.5–3.5 bar) is enough for residential RO to work without a booster pump.
Plastic rooftop water-storage tank common in Dubai. Heats to 45°C in summer, degrades over time, leaches microplastics and plasticisers into stored water.
Measure of water acidity/alkalinity. Dubai tap runs 7.3–8.2 (slightly alkaline). RO output without mineralisation is 5.5–6.5 (slightly acidic), which is why mineraliser stages are important.
The process by which additives in plastic tanks and bottles migrate into water — accelerated by heat. A key reason bottled water stored in Dubai summer is not as clean as advertised.
Micron-rated mesh cartridge that captures particulate 1–5 µm. First stage in most RO systems; protects downstream carbon and membrane from clogging.
Under-sink storage cylinder (typically 3.5 gallons / ~13 L) that holds filtered RO water ready for immediate use. Uses compressed air to push water to the tap.
Ratio of filtered water output to total feed water. Residential RO: typically 25–40%. The rest is rejected brine, which in Dubai is usually diverted to grey-water.
Filtration method where water is forced through a semi-permeable membrane, rejecting 95–99% of dissolved solids. The gold standard for residential drinking-water purification.
Thin-film composite (TFC) semi-permeable layer that blocks particles down to 0.0001 µm. The core of any RO system. Typical lifespan in Dubai: 2–3 years.
Building-level water storage tank, typically PE or GRP plastic. Stores DEWA water for distribution within the building. Principal source of heat exposure and microplastic contamination.
Visible calcium-carbonate buildup on kettle elements, showerheads, and glassware. Symptom of hard water. Not removed by RO unless whole-house softening is added.
Suspended particulate matter — rust flakes, sand, clay. In Dubai, sediment levels peak after building riser flushes or tank cleanings. Stage 1 pre-filter handles it.
Combined mass of dissolved material in water, measured in mg/L or ppm. Dubai plant output is 80–120 mg/L; at the consumer tap it routinely reaches 300–800 mg/L.
Handheld electronic device that reads dissolved-solids content in 5 seconds. AED 40 on Noon. Essential tool for verifying filter performance.
Thin-Film Composite RO membrane — the modern standard. Polyamide active layer on polysulfone support. Rejection efficiency 95–99%.
Water filter installed inside the kitchen cabinet beneath the sink, with a dedicated tap on the countertop. Standard form factor for residential RO in Dubai.
Ultraviolet light at 254 nm that damages bacterial and viral DNA, providing log-6 (99.9999%) microbial inactivation. Optional post-treatment stage for RO systems.
See "hard water." Measured in mg/L as CaCO₃ or degrees of hardness (dGH, °f). Relevant to kettle scale, skin feel, soap performance.
Whole-house system that swaps calcium/magnesium for sodium via ion exchange. Different from RO — softens every tap but removes no other contaminants.
World Health Organization reference levels for safe drinking water. Palatability ceiling for TDS: 300 mg/L. Most of Dubai tap water exceeds this.