Hydrospas Automatic Chemical Dosing System

Revolutionising the Holiday Let Business. Test and maintain your hot tub water remotely! No more physical tests and balancing of Ph, Bromine / Chlorine levels twice a day. Now it can all be done via the Hydrospas Automatic Dosing System while saving all historic and real time data on your computer AUTOMATICALLY – 24hours a day.

  • Hassle-free water management
  • Safe and hygienic water
  • Conforms to HSG282 Guidelines
  • Automatic and precise chemical balancing of Ph and Bromine / Chlorine
  • Remote Connectivity
  • Reduced chemical costs and reliable results
  • Ensures customer satisfaction: balanced water
  • Real time and historic data for all modules
  • Graphic and text logs for trend analysis
  • Alarm and status updates
  • Email & text alerts for chemical status
  • Unlimited modules on an account
  • Access from any web enabled device
  • Saves on labour and maintenance costs

* Price is subject to survey

Safe and Clean Hot Tub Water
For pools and hot tubs, getting the pH and chlorine levels just right can be quite a hassle.
The Wellis Auto Dosing Controllers take the worry out of maintaining proper pH and chlorine levels by handling it automatically.
Readings are taken and stored in the on-board memory every 10 seconds, and when adjustments are needed, the controller adds the precise amount of chemicals to keep your water clean, safe, and free from algae and bacteria.
Our controllers also adapt to tub usage and bather volume, helping you save money on expensive chemicals while offering more accurate control than manual dosing.

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Technical Specifications
Parameter Specification
Range
pH 0.00 to 14.00 pH
Redox (ORP) ±2000 mV
Temperature -5.0 to 105.0 °C
Resolution
pH 0.01 pH
Redox (ORP) 1 mV
Temperature 0.1 °C
Accuracy
pH ±0.05 pH
Redox (ORP) ±5 mV
Temperature ±1 °C
pH calibration Automatically at 2 points
Temperature compensation Automatically from -5.0 to 105.0 °C
Alarm High and low, separately adjustable for each parameter
pH and ORP control Proportional with adjustable set point and proportional band, delay time and overdosing protection
Analogue outputs Three
Memory Measurements pH, ORP, temperature, data (error, alarm, power failure)
Pump control Manually, from 0.5 to 3.5 l/h for each pump
Safety Programming and calibration password protected
Connection USB / Ethernet
GLP pH / redox / °C
Power Adapter 220 V
Controller dimensions 245 × 188 × 55 mm
Panel dimensions Between 7.0 and 7.6., Between 7.2 and 7.4
Weight/td> 1700g-3320g
There is no additional information available for this product.
There is no additional information available for this product.

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HSG282 Compliance Information

HSG282 is the UK Health & Safety Executive’s guidance for controlling the risk of Legionella and other infectious agents in hot tubs used in holiday lets and similar business settings. If you provide a spa for paying guests, compliance with this standard is strongly recommended.

Our Holiday Let range has been designed with HSG282 in mind, helping operators meet the key requirements:

  • Automatic chemical dosing (chlorine/bromine) – no floating dispensers.
  • Ozone/UV secondary sanitisation for added protection.
  • Hydraulic design for rapid water turnover (approx. 15 minutes).
  • No air blowers, reducing aerosol risk.
  • Continuous filtration and heating via automated cycles.
  • Easy water testing with clear access points for twice-daily checks.
  • Risk assessment templates and logbooks provided to support record keeping.
Important to Note

Actual compliance depends not only on spa design, but also on how the spa is operated and maintained:

  • Carrying out twice-daily water tests (disinfectant & pH).
  • Weekly (or per changeover) water changes.
  • Keeping accurate maintenance and testing records.
  • Following safe bather load limits and displaying user rules.

Our HSG282-ready spas make it easier to stay compliant, safe, and audit-prepared in holiday let environments.