We are replacing our liner today after a blowout a few weeks ago. We found this when we pulled it up. What, if anything, do we need to do before putting in the new liner? We have a foam pad for bottom and a foam cove.
I would bleach it. 10:1 usually works but I always go 50/50. I have seen similar mold/mildew show through thinner liners. It won’t hurt anything under the new impervious liner but it’s possible you will see it.
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