As already said, I doubt if any tank chemicals sold today still have formaldehyde, so you probably don't have to worry about that. But, no, you definitely do NOT want to use any chemicals that have such in it.
As to whether or not to use chemicals at all, that is a personal decision. It is very questionable if they help much with breaking down solids, but when the right chemicals are used and used properly, they DO help reduce odors. That is why many folks chose to use them. Yes, in a perfect world where nothing ever goes wrong, chemicals should not be necessary and odors should be contained. However, in the real world where things can and do go wrong at the most inopportune (spelling?) times...Tank chemicals provide good insurance against embarrassing nasty odors. :)
lanerd wrote:
Waiting for Willaid to come on and tell us differently.
..I did a search, have not found anyone on this forum with an alias of 'Willaid'. Who is that, Ron?