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OK so this is something that can happen...somewhat common I hope! Actually the patio does get quite a bit of Sun. We have trees around but during most of the day it gets full sun. I would say full sun for most of the hottest parts of the day during summer. I lay out on that patio sunbathing during that time. I was thinking that perhaps the placement of the patio.....between the two large additions causes that patio area to act like a basin...catching rain and ground water and this all rises from below bringing with it the sludge. If I powerwash it what do I use to fill the gaps? I think the landscaper used just sand..is there something else that would be more permanent????
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