Pool replacement lights help/question

[Lykly]

Since my pool is empty getting ready for plaster, and I've never owned a pool before, I went ahead and took out a couple of lights so I could see exactly how things work. I am thinking of switching to LEDs, and also a salt water generator. As you can see from the pictures, it clearly states freshwater only. Is this a problem, or is it just something they put on standard or will a SWG cause me a issue? Also, this is far is I tore into them, I am guessing if I continue to remove the cover the light just screws in and out? I guess my biggest concern is salt water. Thx

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[Lykly]

I did not want to take this gasket off for fear it might be one piece, do you know if this comes off and if the bulb screws out? I find that hard to believe the bulb is not removable and you would have to fish wire to replace a light?

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