Hey, new to this site but I've been brewing for a while now. I have recently gotten back into brewing after taking a year off and my beer has some popcorn like chunks growing just under the surface near the top. It's in secondary and this is the 3rd week. At first I thought it was krausen but I've done many batches and have not seen anything the likes of this before. The last places I have lived I've always used filtered water but the faucet I have here wont support a water filter so I'm thinking something may have gotten in through the water? Anyone know what this is.