When our pool was installed about 7 years ago, I made the unfortunate choice of having the pool company install a Hayward light (it was an option). This required them cutting a hole in the pool wall similar to what is done for the skimmer. I have a deck around half of the pool and the light is under the deck side, so kind of out of sight, out of mind (meaning I don't even see it 99.9% of the time). Although the light itself works great, it has leaked repeatedly over the years despite me changing the gaskets twice. It sucked to have to change the gaskets because I had to drain the pool water down to the light to do so and refilling is a challenge because we have well water with limited pressure. But I did it...
Now the light is leaking yet again and I have determined there is a small rust area beginning to form just below the light. It's minimal yet I've noticed it has increased the leaking to a steadier drip. At this point I have had it with the light and don't care whether I have it or not. It's cost me so much time and hassle over the years and now I am worried it could destroy my pool wall with rust left in it's current state.
I'm in the process of closing the pool and decided to drain the pool several inches below the light and deal with it now (pictures were taken before it got down as far as it is now). I'm trying to decide the best plan of action. My first thought is to remove the light and use a high quality vinyl patch over the hole. It looks like if I get a decent patching product they work ok. I'm not that worried about looks because its in a spot that people don't really see it. My only concern with that plan is that there will still be a 4" hole in the pool wall behind the patch and I'm worried someone could push through it possibly. I could always put a piece of sheet metal over the hole on the outside of the pool as a backing. It's under the deck so no one would see it. I wish the added backing could be between the liner and pool wall but I have no way of getting it between the two. I could do that some day when I change the liner but I have no reason to change it right now.
Thoughts? Is there a better way to seal a hole like this?