For over 30 years, Harwil has continued to make switches chosen by nearly every pool and spa component manufacturer in the industry.
The legendary Q-12 flow switch can be used in ¾ to 2-inch pipe and is capable of detecting even the lowest flow rates. The Q-12 flow switch is used in almost every salt chlorinator to ensure sufficient flow before the plates are energized. A thermistor option can be added to give your unit the advantage of temperature sensing.
Harwil flow switches are used in spas to keep heaters from running in unsafe conditions and protecting the users & their equipment. The Harwil Q-8 flow switch is used in high flow and/or below ground systems, to control UV and OZONE systems, turning on when conditions are ideal. The CF-12 and CF-8 are used to control chemical feed pumps for residential and commercial pools.
Featured Products
CF-8 Chemical Feed Pump Controller pipe 1 - 6 Inches
The CF-8 is ideal for where higher flow rates are need such as commercial swimming pool chlorine injection or to control UV or Ozone Systems.
CF-12 Chemical Feed Pump Controller for pipe ¾ - 2 Inches
The CF-12 is ideal for where low flow rates are need such as residential swimming pool chlorine injection or to control UV or Ozone Systems.
The Q-12 is probably the world’s most popular Flow Switch.
This robust and accurate flow switch has been the heart of just about every salt chlorinator and in spas to protect the water heater.
The Q-12DST is the best Flow Switch with temperature sensing.
The Q-12DST is combined with temperature sensors (QT-12) to provide two functions from a single device which is ideal for salt chlorinators.
Adjustable Water Proof Flow Switch with 15 Amp load capacity
The Q-8 flow switch is idea for pool heaters that are above or below grade. The Q-8 can also guarantee that there is sufficient flow.
Adjustable Paddle Style Flow Switch 15 Amp load capacity
The Q-16 is designed to replace problem paddle style flow switches. The seals and paddles are much more robust than the competitors. All paddles included.