| Activated Alumina Pressure Vessel | 0.5–20 m³/h per vessel | Requires a level, ventilated area, inlet and outlet piping, prefiltration, drainage, and a backwash connection. Feed pH is commonly controlled around 5.5–6.5 for effective adsorption. | Check pressure drop, flow rate, pH, fluoride concentration, and leakage at least monthly. Replace or clean prefilters as needed. | Media life is commonly 6–24 months, depending on fluoride loading, pH, competing ions, and treated volume. Periodic regeneration may be possible for certain media grades. | Approximately US$0.05–$0.30 per m³, excluding capital recovery and disposal costs. | Small communities, commercial buildings, and industrial pretreatment where water recovery is important. |
| Two-Stage Adsorption System | 2–50 m³/h, depending on vessel size | Needs two or more vessels, isolation valves, sampling ports, flow control, a backwash line, and sufficient floor space for safe media handling. | Test treated water from each stage monthly or according to the compliance plan. Rotate lead and lag vessels when the first stage approaches breakthrough. | The lead vessel is typically serviced first. Media replacement intervals often range from 9–30 months when breakthrough monitoring is properly applied. | Approximately US$0.08–$0.40 per m³, depending on media consumption, testing frequency, and wastewater handling. | Facilities requiring more reliable fluoride breakthrough control and continuous treated-water quality. |
| Reverse Osmosis System | 0.1–100 m³/day for packaged units | Requires electrical power, feed-water pressure or a booster pump, sediment and carbon pretreatment, a concentrate drain, membrane housing, and freeze protection where necessary. | Inspect pretreatment weekly, monitor feed and permeate conductivity, check recovery, and sanitize the system at intervals recommended by the membrane supplier. | Membranes commonly last 2–5 years with suitable pretreatment. Prefilters may require replacement every 1–6 months. | Approximately US$0.20–$1.00 per m³, including electricity, pretreatment, cleaning, and concentrate management. | Applications requiring fluoride reduction together with removal of dissolved salts, nitrate, or other contaminants. |
| Small Point-of-Use Adsorption Unit | 1–10 L/min | Requires a dedicated tap or small feed connection, adequate water pressure, a cartridge housing, and enough clearance for cartridge replacement. | Check flow and taste or odor changes regularly. Use a scheduled replacement plan rather than relying only on appearance. | Cartridges commonly last 3–12 months, depending on daily consumption and influent fluoride concentration. | Approximately US$0.15–$0.80 per m³, excluding the initial purchase and installation. | Drinking-water points in homes, offices, clinics, schools, and other low-flow locations. |
| Ion Exchange Fluoride-Selective System | 0.5–15 m³/h | Requires pretreatment for suspended solids and competing ions, a regeneration or brine handling arrangement, drainage, chemical storage controls, and trained operators. | Monitor fluoride, pH, conductivity, pressure drop, chemical strength, and regeneration performance. Keep accurate operating records. | Resin service life can range from 3–8 years when properly regenerated and protected from fouling; actual life depends on water chemistry. | Approximately US$0.15–$0.70 per m³, including regenerant chemicals, rinse water, labor, and waste handling. | Industrial or municipal installations where high fluoride selectivity and controlled regeneration are acceptable. |