I suspect two options. Either chisel out the old in that area and press in some new grout, or look for some polyurethane caulking. Either way may not be a perfect match, but if your main goal is to keep insects and water out, that may be it.
Hi, thanks for the reply. Can I ask for you to elaborate on "why" I should/need to leave it open? My pool was just completed about a month ago and I'm not sure if they left it open on purpose or forgot?
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