Pool part question

cs7

Member
Jun 27, 2022
18
Washington, DC
Pool Size
17000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Hayward Aqua Rite (T-15)
I am trying to better understand my pool system equipment. What is this thing, which has a wire going to it from the controller? It is on the same pipe as the SWG cell, on the outflow side. Thank you!
 

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