I had a pool put in and they never hooked it up. Brand new! I have the owner's manual as well.
COMPLETE IN-LINE CHLORINATOR 2" SKT, CL2002S
In-Line Chlorinator for both above ground and in-ground pools and spas
Uses small, slow dissolving Trichlor or Bromine tablets or sticks
Works on newly constructed or already existing pools and spas
Requires simple installation when replacing existing chlorinator or brominator
Easy-Lok threaded cover feature for safe and convenient access to add tablets or sticks
Unique finger-release catch provides extra security
https://lesl.a.bigcontent.io/v1/static/Hayward-CL2002S-Complete-In-Line-Chlorinator-User-Manual