I've been an irresponsible pool owner and unfortunately I let this sit for quite a while due to life happening. What's the best way to clean, seal, and replace the tiles? I have the original tiles that came off in a plastic bag.
And is there any way to reinforce/proactively do something to the rest of them to prevent this from happening elsewhere? Thanks for the help!!

And is there any way to reinforce/proactively do something to the rest of them to prevent this from happening elsewhere? Thanks for the help!!
