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Our pool is a 20,000 gallon in-ground concrete salt water pool. The shallow end is 4' deep, center is 6' deep, and the other end is 5' deep. We have had a lot of very small earthquakes here on Guam, and the pool has now become uneven - deeper on one side than the other, with a difference of about 3-4 inches. There is also a crack that goes down in the corner of the pool. It doesn't seem to be a deep crack, and my water bill hasn't become a lot higher, so I don't think it's leaking. This has happened gradually over the past several years. Another problem we have is that the rebar wasn't sufficiently covered in a couple of places, so we have some pretty bad rust. One spot is on the surface of the pool deck, and the other is at an edge (corner) where tiles meet. We've also developed a lot of black algae spots in the bottom and on the sides of the pool. So, we don't know whether to have the pool resurfaced or drained and acid-washed, or what to do. We need to figure out how to repair the crack in the pool too. Any information or suggestions from anyone would be greatly appreciated.

I'm about to paint my older pool, now that I've done a complete resurfacing on it, due to some rust spots. I was in this big maintenance cycle in 2010 - and now again in 2013 It really turned out good previously, but I'm trying to do everything I can to minimize the maintenance, and put the best fixes in for Long-Term. I even have pictures of the Before and After, in 2010 - and let me tell you, it started pretty Ugly. Here's my recent pictures/post, from just this year: Pool, bad - Start of 2013 http://imgur.com/dD1tXw8,ZxTWQnA,5VUkyvm,VIRKdtg#2 After grinding any rust out, down to the bare steel, and cleaning, I've used a thick layer of AboWeld to patch the seams and repair any rust spots. ( It's the first time, I've used such a product - allthough I hear WallNew was quite popular too ) **** Now I'm looking for painting tips or techniques, and How to Do It Right. **** I've already gotten the paint, and it's from Kelly Technical Coatings: Olympic Zeron epoxy paint. I might go about it this way: Rough up any AboWeld spots with course sandpaper, to allow the paint to grip better. Clean and brush down, with TSP solution ( 1/2 cup, to 2 gallons ) Clean and brush down, with Muriatic acid solution ( 50/50 muriatic acid/water ) Clean and brush down, with TSP solution Make sure it's dry and I have 5 relatively Dry days ahead. Mix the epoxy paint, and apply. Tips welcome from anyone experienced. This is a Big Big job, especially since it's an IG pool, 35,000 gallons, and it's 17' by 42' I don't want to make a mistake and it's got to be quality work, throughout. ps: It's steel-sided, with a concrete bottom. I'm going to be painting over the last coat of paint - there's only 5% of it (seams & edge) that needed patching. On the bottom, just dirty in spots, stained with dirt, and a few rust spots too, I think from metal shards that got loose and landed on the bottom ( during the grinding/resurfacing process ). Eventually, this whole thing will need a rebuild, and I'm looking forward to Low-Maintenance, compared to all this; I'd be glad to hear suggestions on modern builds, materials and what is used to build new pools too.