Like the Romans used to drink from lead cups. Something like that.
(it appears that the moderator is removing any replies with which he disagrees. It might be a piefed issue. But all the removed replies are top level and upopular. Stranger coincidences have happened I suppose.)
The hoops and “huh?”s I had to go through to get an ERV installed was astonishing. Finally found an installer the next town over and it wasn’t cheap, but worth it every time I look at my indoor air quality monitor.
ERV? Can you tell us about the benefits?