What Are The Benefits Of Automatic pH and Chlorine Control? 

An automatic measuring and dosing system such as the Hanna BL-121 is a digital device that is installed in your plant room. 

Through a combination of measuring sensors, dosing pumps and liquid chemicals, the pH value and the chlorine content in your pool or spa are continuously measured and maintained freeing you up to enjoy your pool.

Automatic dosing provides you with the following benefits:  

• pH and free chlorine values are continuously measured and automatically adjusted 
• The bathing water is clear and disinfected 24 hours a day 
• No need to manually add chemicals to your pool 
• No more problems with cyanuric acid 

With an automatic control system looking after your pool, you should check the pH and free chlorine less often, but a weekly manual check is still recommended using a digital meter.