Light film under filtered wax

[Abbee]

Hi all.
Been using a solar wax melter. Loving it.
I'm getting a very fine light film at the bottom of the wax. See attached image.
This is after I have filtered it. I filter it with a sheet of kitchen paper, I pour it into a foil container and pour boiled water and let it set.
It can be scraped off or rubbed off. It looks like wax.
Just wondering what it is.

 

[beeno]

That's why you should be using rainwater. Tap water too hard in most areas.

 

[Erichalfbee]

It’s the chlorine in your water that’s doing this. Use rainwater.