Ascorbic acid washing and doing some repairs

[chem4life93]

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I am going to be doing a ascorbic acid wash to remove the stains and draining the pool 3/4. I would like to repair the "chips" in the plaster... Any suggestion on a product to use, also any suggestions about the crystal growth on the tile grout on the seat and stairs?

 

[chem4life93]

A few more photos


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