Medium-Pressure UV Reactors for Pools & Spas
Medium-pressure UV is a broad‑spectrum disinfection system for swimming pools, water parks, spa zones, and hydrotherapy basins. The reactor sits in the recirculation loop; water passes through a stainless steel chamber fitted with medium‑pressure UV lamps. Radiation damages microorganism DNA and initiates photolysis of chloramines and other nuisance compounds that drive typical “pool smell” and user irritation.
High‑intensity UV dose, short contact time, and stainless steel construction make these systems suitable for public‑grade pools with heavy usage and strict water chemistry targets.
Broad-Spectrum Disinfection and Chloramine Control
UV Action in the Reactor
Inside the reactor, medium‑pressure mercury lamps emit a broad spectrum of UV‑C and UV‑B radiation. Microorganisms exposed to this radiation lose the ability to reproduce; pathogens are inactivated without adding chemicals.
Inside the reactor, medium‑pressure mercury lamps emit a broad spectrum of UV‑C and UV‑B radiation. Microorganisms exposed to this radiation lose the ability to reproduce; pathogens are inactivated without adding chemicals.
- Reduces characteristic “pool smell” in indoor halls
- Lowers eye, skin, and respiratory irritation for swimmers
- Supports more stable water balance with existing chemical dosing
Disinfection performance depends on UV dose, flow rate, incoming water quality, and temperature. We size systems for the actual basin hydraulics and load profile rather than a generic flow band.
Stainless Steel UV Reactor
AISI 316L Chamber for Pool Hydraulics
The UV reactor is a welded stainless steel pressure vessel, built to integrate directly into pool piping:
- Material: AISI 316L stainless steel, electropolished internally for hygiene
- Connections: flanged DN125–DN350, matched to plant hydraulics
- Lamp configuration: 1–4 medium‑pressure UV lamps per reactor, 1.0–3.0 kW each
- Monitoring: UV intensity sensor, temperature and flow protection, service ports
Reactors are installed with a bypass line and isolation valves to allow lamp replacement and maintenance without draining the basin or shutting down the entire filtration system.
Set downstream of filtration and upstream of heating and chemical dosing, the reactor works on filtered water with stable chemistry, maximizing UV transmission and lamp lifetime.
Integration Into Pool Systems
Application in Pools, Water Parks, and Spas
Medium‑pressure UV systems are specified for:
- Public and competition pools
- Water parks with high bather load and aeration
- Children’s pools with stricter microbiological targets
- Hydromassage tubs, whirlpools, and spa zones with elevated temperature
Typical integration points:
- Recirculation loop after sand or multi‑media filters
- Common line treatment for multiple basins where hydraulics allow
- Dedicated lines for high‑risk or high‑load basins (children’s, spa, therapy)
Penetrations, supports, and sensor locations are coordinated from drawings. Electrical cabinets are positioned in the plant room with clear access and ventilation; cabling runs in defined trays.
Installation and Service
Tie-In, Commissioning and Maintenance
Sequence is fixed. We review hydraulics and plant room layout, select reactor size, and confirm tie‑in points.
During installation:
- Shut down the relevant line during a planned maintenance window
- Cut in flanged connections; install reactor and bypass spool pieces
- Set UV sensor, temperature and flow protection, and drain points
- Connect electrical cabinets; route control cables in existing trays
- Commission lamps, verify interlocks, and log UV intensity at design flow
Routine service includes lamp replacement on hours run, cleaning of quartz sleeves, and verification of UV sensor calibration. Bypass and isolation valves allow service with minimal impact on pool operation; short shutdowns cover lamp replacement and sensor work.
Clean work area, low noise; installation is compatible with operating facilities.
System Specs
Medium-Pressure UV System Technical Summary
- System type: medium‑pressure UV disinfection and chloramine reduction for pools and spas
- Reactor: welded AISI 316L stainless steel chamber, electropolished internal surface
- Lamp type: medium‑pressure mercury UV lamps, broad spectrum (approx. 200–600 nm)
- Lamp power: 1.0–3.0 kW per lamp, per model
- Lamp count: 1–4 lamps per reactor, depending on flow and UV dose
- Flow range: 33–630 m³/h per reactor, per model
- Connections: DN125–DN350 flanged ends, matched to pool piping
- Monitoring: UV intensity sensor, temperature/flow safety, hour counters
- Integration: downstream of filtration, upstream of heating and chemical dosing
- Chemistry: compatible with standard pool water balance (pH 7.2–7.6, free chlorine per local code)
- Application: public pools, water parks, children’s basins, hydromassage and spa zones
- Maintenance: lamp replacement by hours run; cleaning via mechanical or manual sleeve wipers
Model Range
UV Reactor Models UV Reactor Models
| UV unit model | Number of lamps | Lamp power, kW | Flow rate, m³/h | Flange internal diameter |
|---|---|---|---|---|
| UV unit-1-1-33-125 AISI 316L | 1 | 1.0 | 33 | DN125 |
| UV unit-1-2-88-DN150 AISI 316L | 1 | 2.0 | 84 | DN150 |
| UV unit-1-3-207-DN250 AISI 316L | 1 | 3.0 | 207 | DN250 |
| UV unit-3-3-462-DN300 AISI 316L | 3 | 3.0 | 462 | DN300 |
| UV unit-4-3-630-DN350 AISI 316L | 4 | 3.0 | 630 | DN350 |
Questions & Answers
UV System FAQ for Pool Engineers
Yes, provided we have space for the reactor, bypass, and electrical cabinet, and can confirm tie‑in points on the recirculation loop. DN sizes and layouts are coordinated from existing drawings.
UV handles microbiological inactivation and chloramine reduction; chlorine remains as the primary residual disinfectant. In many cases, free chlorine setpoints can be held lower while meeting microbiological targets.
We take pool type, bather load, flow rate, target UV dose, and hydraulic layout. From this, we select lamp configuration, reactor size, and number of lines, then provide a model schedule and integration details.
Lamp replacement per operating hours, cleaning of quartz sleeves (manual or via integrated wiper), visual inspection of seals and sensors, and periodic verification of UV intensity readings.
Systems are specified and operated in line with relevant pool water treatment guidance and national standards for UV disinfection and chloramine control in public pools.
Get Technical Drawings →
Talk to an Engineer
Ready to Specify a Medium-Pressure UV System?
Send basin drawings (plan/sections), recirculation flow data, water chemistry targets, and plant room layout.
We will return reactor selection, lamp configurations, tie‑in details, electrical cabinet requirements, and an installation sequence matched to your site.
