Rust Stains from the tie wire or rebar inside the pool shell will only get much larger after a while. Resurfacing the whole pool is the sole way to get a regular, stain-absolutely free try to look for the pool surface area. Occur and find out how the tile feels, https://www.google.com/maps/place/Griffin+Dynasty+Pools+%26+Pavers/@27.7793049,-82.6548205,11z/data=!4m6!3m5!1s0x4ea47cc567c5af85:0x3f1f6209a7aded4a!8m2!3d27.7793049!4d-82.6548205!16s%2Fg%2F11y5bjy0ww?hl=en&entry=ttu