Automatic Chemical Feed Equipment
There are many types of chemical feed equipment used to treat swimming pool water. The most common types of equipment are as follows:
Diaphragm Chemical Pumps
A positive action diaphragm pump uses a vacuum stroke to lift the chemical from the storage tank and a pressure stroke to inject the chemical into the return line to the pool. Diaphragm pumps will operate in a higher PSI application. The speed of the pump is adjustable and can be set to the proper amount of chemical needed daily.
Peristaltic Chemical Pumps
Peristaltic pumps use a roller assembly to squeeze a tube, wrapped around the roller assembly, which creates a wavelike contraction in the tube creating a vacuum and lifting the chemical from the storage tank and injecting the chemical into the return line of the water going back to the pool. Peristaltic pumps are limited to applications less than 25 PSI. These pumps are also adjustable for the amount of chemical needed daily.
Since all chlorine has a tendency to crystallize or clog check valves and injection fittings, your chlorine pumps must be cleaned on a regular basis.
Erosion Chemical Feeders
In order to use chlorine tablets or bromine sticks, you must have an erosion feeder. The tablets or sticks are placed into a chamber in which pool water flows through. As the water flows through the chamber, it slowly dissolves the tablets or sticks and permits the chemical to return to the swimming pool or spa water. There are valves to adjust the amount of water passing over tablets or sticks, thus allowing an adjustment of more or less chemicals. General cleaning is the only maintenance necessary.
CO2 pH Control System
CO2 pH Control System injects carbon dioxide gas into the pool water recirculation system, where it forms carbonic acid. This relatively weak acid lowers the pH to the ideal range of 7.2 - 7.8.
A CO2 feeding system consists of single or dual cylinders of CO2 gas, which are connected through a pressure regulator and a flow control unit to an injector in the filtered water return line.