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Online, I read/watched people praising quilt batting filtration, and that it's best to go to Walmart and buy their cheap batting. I've been a hand needleworker for decades. I know what cotton, rayon, silk and metallic threads are and how to use them, as well as thread count. However, I know nothing about machine quilting and even less about batting. So, I did some research. Polyester quilt batting is just fluffy polyester, flattened via some process or another. I know enough that a John Deere tractor can't permanently flatten that stuff. The flattening process is called 'bonding', and it can be done via a thermal process or using resin. Can anyone tell me whether resin bonding or thermal bonding is safer for the fish?