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So I have two of these copper things sticking out of the side of my pool and I have no idea what they are. Thoughts?

First time spa owner here. Bought this house with a pool and a separate spa on Monday. I've been getting moved in and trying to get a handle on the pool chemistry, so I'm just now getting around to the spa. I tested the water this am with the TF-100, results are below. pH: 7.8 FC: 1 CC: .5 CH...

So a week from Monday I close on a house with an in ground pool. I've never owned a pool of any kind so the whole thing is new to me. I've been reading up on the pool school stuff and I think I have a handle on the basic chemistry stuff. I have a TF-100 test kit on order. The current owners are...