Can we put plastic container on the coil while doing treatment? If not, what container should we use? Why?

1. It is best to use a glass container. Plastic is not so permeable to magnetic fields. This means that the field becomes weak once it passes through the plastic. 
2. I suggested that the plastic tops should be removed and a marble placed on the top of the bottle. One could use lapping compound to grind the marble into the mouth of the glass a little to create a decent temporary seal.

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