We had our in ground pool built in beginning of 2017 and was great for a couple years. Then in rain season of 2019 I started to notice mud seeping through in a couple spots between the pool shell and the deck seams. I talked to the builder and he said it happens sometimes because there's no way to seal that gap completely between shell and deck and when the water level is high from rain it will start pushing mud through. He sent a guy out that blasted some high pressure water in the gap to clear it out but seems to only be worse since then and coming out in more areas now. I haven't seen anyone complain about this same issue on this site before so don't think it's very common. Anyone heard of this or know what really causes it? Did the builder screw up and do something wrong? I can't believe this would be an acceptable thing for anyone. I have to go clear the mud after every time it rains or I end up with globs of mud in the pool bottom. Very frustrating to say the least.