ASIN Aqua Chlorine & PH Automatic Pool Dosing System




ASIN Aqua Chlorine & PH Automatic Pool Dosing System

asin aqua pool dosing system

1. Description

The ASIN Aqua automatic pool dosing systems provide an easy to use touch-screen dosing system at a very low cost.

They can be used for private or small commercial swimming pools with a water volume up to 250m3 (the optional free chlorine probe should be used for commercial pools)

They have a touch screen display with simple and clear operation, whilst measuring and regulating the chlorine and pH levels in your pool.

This is an automatic dosing system which can be used for indoor or outdoor pools.

The system constantly monitors the level of chlorine and pH in the pool and adds the required amounts of chemicals to maintain the pool at the desired levels.

It has an easy to use touch screen control panel, which allows you to set the desired level and monitor the current levels of chlorine and pH in the pool.

The flow switch prevents the unit from dosing the pool when the pool circulation pump is turned off and there is no flow of water to the probes.

The ASIN Aqua system doses liquid chlorine (sodium hypochlorite) to increase the free chlorine level and acid (sulphuric acid) to lower the pH

ASIN Aqua Chlorine & PH Automated Dosing System


Watersens Chlorine & PH Automated Dosing SystemWatersens Chlorine & PH Automated Dosing System


The ASIN Aqua is available as four models:-

  1. ASIN Aqua Redox – Redox based system, non internet enabled
  2. ASIN Aqua Free Chlorine (CLF) – with Free Chlorine probe, non internet enabled model
  3. ASIN Aqua Redox Net – Redox based system, internet enabled
  4. ASIN Aqua Free Chlorine (CLF) Net – with Free Chlorine probe, internet enabled model

Watersens Chlorine & PH Automated Dosing System


2. ASIN Aqua NET Features

The ASIN Aqua NET models allow the user to  look at the data from the pool in real time from your mobile device, allowing you to set notifications for set parameters. This data can be viewed for a 30 day period using the iPool app or web browser.

This allows remote monitoring of your pool chlorine, pH and temperature levels via either an app on a smartphone or via an internet web browser

The IPool Live App is available free of charge to all ASIN Aqua NET users.

Watersens Chlorine & PH Automated Dosing Systemipool-live-app-pic2.JPG


The app allows the user to remotely monitor the levels of chlorine and pH for the pool

Alerts can also be set so that if the chlorine or pH fall below or above a set level, an alert is sent to warn the operator.

This data can be viewed for a 30 day period using the iPool app or web browser.

This log of chlorine and pH levels is valuable for commercial pools as they are required to keep an accurate record of the chlorine levels (in ppm)


If you do not have an internet connection where the ASIN Aqua will be located, an easy solution is to use a pair of powerline adaptors. One of the plugs goes into a socket in the pool plant room. The other plug goes next to the wifi router in the house.

An Ethernet cable is then connected from the powerline adaptor to the router and the ASIN AQUA to deliver internet connectivity.

Please contact us if you would like advice on the best way to get internet connectivity to the pool plant room.

3. Redox Probe


The ASIN Aqua pH/Redox model comes complete with probes to measure the chlorine and pH levels

With the redox model, the amount of chlorine in the pool is displayed in a mV reading on the screen.

By setting the desired mV value, the ASIN Aqua will add liquid chlorine to the pool to maintain the chlorine level at the desired value.

4. Free Chlorine Probe

As an alternative to the redox probe for chlorine control, a free chlorine probe is available with the free chlorine (CLF) models

The free chlorine probe displays the actual amount of chlorine in ppm (parts per million) e.g. 1.2 ppm

The free chlorine probe is normally required for commercial pools as they are required to keep a log of the actual free chlorine levels in ppm (parts per million)


Note that when using the free chlorine (CLF) probe, the pool water must not contain any stabiliser (cyanuric acid) as this affects the operation of the CLF probe. The redox probe is unaffected by stabiliser (cyanuric acid)

Watersens Chlorine & PH Automated Dosing System


5. PH Probe


The pH probe accurately measure the pH level of the pool water so that the system can add acid to adjust the pH level as required.

Note that in 2022, the probes were moved to be on the outside of the ASIN Aqua case in probe holders. In 2022 and before, the probes were installed into holes in the body of the ASIN Aqua case, hence some photos on this page may show both types. The operation of the unit remains unchanged.

6. Included Items

The ASIN Aqua comes with the following:-

  • ASIN Aqua touch screen controller
  • 2 x Injector nozzles
  • Plastic hose to deliver the chemical from the tank to the dosing unit and the pool pipe
  • 2 x weights to go on the end of hoses in chemical containers
  • pH Probe (comes with all models)
  • Redox (Rx) Probe (with the redox models)
  • Free chlorine (CLF) probe (with the free chlorine/CLF models)
  • Water temperature sensor (with 2.8m cable) and pocket are included with the Net models
  • 2 x valves for sample tubes
  • Instruction manual
  • Snap knife (for cutting tubes)
  • 16m of 1/4″ PE tubing


(In Addition to the above, the water temperature sensor and pocket are included with the Net models)

7. Technical data

  • Power supply: 230V/50Hz
  • Power consumption: 14 VA
  • Fuse: T80 mA
  • Over-voltage category: II
  • Ingress protection: IP 50
  • Operation temperature and humidity: +5 to +40°C / 60%
  • Measuring water pressure: max 1,5 bar
  • Measured and regulated value: Free chlorine or Redox and pH
  • Dosing pump capacity: 60ml/min. / max. 1bar
  • Pool volume: max. 250m3
  • Weight: 2,2kg
  • Emplacement: wall-mounted

8. Installation

Installation is straight forward.

Installing the ASIN AQUA Chlorine & PH Automated Dosing System

A pipe fitting (e.g. an elbow) is drilled and tapped so that the chemical injection nozzles can be screwed into the pipe

Watersens Chlorine & PH Automated Dosing System

Please read the user manual below for more information on how to install the ASIN Aqua system

Watersens Chlorine & PH Automated Dosing System

9. Chemical Bund Tanks

We recommend that you purchase two “bund” tanks

These allow the standard 20 and 25 litre containers of liquid chlorine and acid to simply be placed inside the bund tank

This makes it very easy to swap the containers when they are empty

The bund tank is designed to hold all of the 20 or 25 litres of pool chemical should the container leak or split.

The bund tank then prevents the chemical from spreading over the floor of the pool plant room which could cause damage to the equipment in the plant room.

We have two types of bund tank available:-

  1. Rectangular bund tank (without the raised back)
  2. Carboy bund tanks (with a raised back)

Rectangular Bund Tanks


The rectangular bund tanks measure 210mm high x 300mm wide x 500mm deep

Carboy Bund Tanks

The carboy bund tanks have a raised back

Watersens Chlorine & PH Automated Dosing SystemWatersens Chlorine & PH Automated Dosing System

These bund tanks should be placed on the floor whenever possible side by side.



One bund tank contains sulphiric acid and the other contains liquid chlorine (sodium hypochlorite)

The dimensions of the Carboy bund tanks are 300mm wide x 440mm deep x 600mm high each

10. Water Temperature Sensor

A water temperature sensor/thermometer is included with the Net models This then displays the current pool temperature on the smart phone app and web browser.


It comes with the temperature sensor and also a threaded pocket to hold the sensor. This pocket can be used with the threaded end-cap (see below)

(Note: This is compatible with the Net versions only)

The sensor has a cable which is approx 2.8m long

11. Optional Items

Remote Touch Screen Display

A remote digital display is available which can be installed inside the pool hall of an indoor pool to show the current chlorine, pH levels and pool water temperature

The levels can also be adjusted from the touch screen if required.

(Note: This is compatible with the Net versions only)


External touch screen. Suitable for ASIN AQUA Net, Home, Oxygen, Salt and Profi (non-touch version).

Allows to control some directly from the pool area:
– switch on / off the filter pump
– switch on / off filter backwash (some models)
– change required values ​​(pH, disinfection, required water temperature)
– Display can be locked with a password

Dimensions: W 253 x H 168 x D 39 mm

Threaded End cap for Injection Nozzles

An end cap is available to allow easy installation of the injector nozzles and the water temperature sensor pocket  into existing pipework.

We have two sizes available for 50mm and 1.5″ pool pipe

End Cap For 50mm Pool Pipe

The end cap is glued into a t-piece and the injector or sensor pocket screwed into the end cap

The end caps fit a 50mm glue pipe socket.

Please contact us for further information

threaded-end-cap-pic3.jpg Injectors installed into a 50mm t-piece with the threaded

end-cap. We sell all of these parts as optional items


End Cap for 1.5″ Pool Pipe

We sell a threaded end cap to fit on 1.5″ pool pipe. This comes with an adaptor to allow the ASEKO injectors and water valves to be screwed into them

1-5-inch-end-cap-for-aseko-pic3Pictures show the threaded end cap for 1.5″ pool

pipe and the adaptor for ASEKO injectors


Drill and Tap for Injectors

We also sell a drill and tap set to allow you to drill and tap the correct thread into a pool pipe fitting (eg elbow)


12. Availability

This item is in stock for immediate delivery – please allow 3-5 working days

13. Delivery

The price includes FREE UK delivery.

We can ship this item to any country. Please contact us for a shipping quote.


14. Warranty

The probes come with a 2-year warranty.

We recommend that you retain the packaging in case you need to return the unit to us for repairs under the warranty. 

The warranty will not apply where the dosing system has been installed incorrectly, or has been damaged by installation, so please advise of any problems as soon as possible.

ASIN Aqua Video

15. Technical Support

We are happy to provide technical support for all dosing systems that we supply.

We can supply all spare parts to support all ASIN Aqua dosing systems both during and after the warranty period

16. Product Literature

Please click the links below to download pdf brochures for these products

Please also see the Literature tab at the top of the page for the Brochure and User Manual downloads.


17. Assistance

If you need any assistance or advice as to which model would be best for your pool, please feel free to call or Contact Us

for more information, also see our FAQs page

All items sold in accordance with our terms and conditions

for all enquiries, please contact us at enquiries@heatpumps4pools.com

Product Literature

Please click the links below to download pdf brochures for these products



We accept all major credit and debit cards, Bank Transfer (BACS) and Paypal

All major credit cards accepted

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The prices shown include FREE UK delivery for orders over £50 or £6.50 for orders under £50

We can ship to any country. Please contact us for a shipping quote.

The lead time on most items is normally on a 1-2 day delivery,  subject to availability. Please call to check availability.