Here I introduce you a simple way to remove the coil properly.
1. When you unscrew the coil, please pay attention not to screw it at a slant angle.
2. When coil has been used for a long time, you can use dry cloth or paper (with stronger friction) to unscrew if it is not easily unscrewed.
As coil is very necessary for your tank, so I think this article is good for you.
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