Hey all.

The niche is permanently embedded in the wall of a 'crete pool, which means you, not only have to bust out part of the wall and repair it to change the niche, but you'll also need to reconnect the conduit. Both these things would 'probably' include having to cut out a section of the deck above the light.

If it's just the light itself, you may be able to seal the metal so it won't rust further and treat the stains with ascorbic acid.

Please let us know.