Our Gunite Pool is approaching 5 years old now with Wet Edge Pebble plaster. At the end of last swim season I noticed some fairly large cracks in the pebble plaster at the deep end of the pool. 2.5 ft long and large enough to put a ball point pen into the crack in some areas (1mm I guess). I have done multiple overnight tests and the pool does not seem to be leaking water out at any measurable rate. I had the Wet Edge rep out to look at the cracks and he says it is because the gunite shell has moved. I figured I would just keep monitoring the cracks and get concerned if and when it starts leaking to a measurable extent. The gunite has a lifetime warranty against leaks. However, I started thinking about the gunite being porous and it is possible that the water is slowly seeping into the gunite, which will corrode the rebar and then make a much bigger problem. Rebar expanding due to corrosion, etc. (I would think this is covered by the leak warranty??). I would hate to have to re-plaster a pebble pool after only 5 years... Should I try and seal these cracks up with silicone or something?? Or just continue to monitor to make sure the pool is not losing water at a measureable rate.