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Robr

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  1. What type of pool surface? CH level (or full pool test results). If plaster, how old? I'd guess when you added the soda ash to one area, it created a VERY high local pH. This caused the staining. This either caused calcium to deposit on the surface (possibly w trapped dirt) or caused a metal to stain. Rub a vitamin c tablet or several of them broken up in a sock, and rub on the stain - a metal stain should lift but scale (calcium) won't. If it's metals, keep the pH 7.5 or lower. Scrub with more Vitamim c / ascorbic acid. If it's a larger area you may need a whole pool metal treatment. Test your water for metals, remove/fix the source, and be careful to avoid high pH and high FC levels. Both types of stains may lighten or lift over time with pH held on the lower side (below 7.5, faster at 7). If your pool is plaster, apply muriatic acid from a squeeze bottle or pole applicator, plus scrubbing nay remove it. There are other possibilities, esp with plaster, but this seems most likely to me.
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