safety

Recently hired a plumber to run some new lines for the kitchen sink and fridge water line. I noticed he used Oatey #5 flux paste which appears to be petroleum based. My question is, is it safe to drink the water on these lines? I was under the impression that he should have used water soluble...

I purchased an air purifier printed 110V. It has a power adapter of 100-240V. Can I use the air purifier with a power supply of 220-240V? Is the adapter also a converter or transformer? I’m really confused.

Morning everyone, Just wanted to drop a note to ask if anyone could recommend a good brand of safety work boots? I was thinking about getting something along the lines of these. They seem like a good investment. I've not had much luck lately - lots of cracked souls and fast wear. Hard to get...