Humidifier additives - safe for grow and safe for dry/cure?

So when you buy a humidifier they often recommend using these additives to keep them clear of any funk. I.e. standing water and then blasting it around the room with the blower.

The last time I ran the humidifier was to keep the room at a target % RH so that the drying tent would be on target. Humidifying the room it was in which during winter even a big humidifier was struggling.

I didn't run any of the additives but I did purchase a bottle. I was hesitant because I knew that was something that would potentially then be within the humidified air taken into the tent. That seemed like a problem to me - I don't want to smoke that shit.

So that leads to my question here. #1 - is it safe to use in veg? what about during flower? Then #2 - is it safe for use when hanging/drying. It would seem to me that I should be trying to run without it. But wondering if anyone knows for sure the pros & cons about this angle.

I wondered about that myself. I have an evaporative humidifier with a filter, rather than use the additive I found extra filters on amazon for $3 each, so I am changing the filter every two weeks, before it can start to smell.

Right. I had also considered if I could use peroxide treatments occasionally to help prevent any issues knowing that it shouldn't present any issues as it breaks down/evaporates (I think). Basically I'm thinking you just need to really stay on top of your preventative maintenance and avoid those chems.