Hello friends: We had an in-ground spa completed in December of 2021. The coping around the spa is a pre-cast concrete, unsealed. A few months after the spa was completed and filled with water, we started noticing blotchy marks on the coping. I had the contractor come by and he took some pics to "show the coping company" but I have not yet to receive any suggestions for correcting. The close up where the most blotching occurs is right above the step. See photos and if anyone has any insight as to what is happening and how it can be corrected, if it can, I would appreciate it.
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