Yep, my first pool.
I have some sort of inline module between my pool pump and my large egg shaped pool filter.
Here is a picture of it - as you can see any information on the label faded long before I came along.
This is a 10,000 gal in ground pool in Tucson.
Currently I am paying a pool service - they don't seem to maintain this part or notice that it is leaking.
Suggestions? Replace it or cut it out?