but what would cause/make this waste product? And also I think there could start to be difficulties with this because depending on what makes it may make problems with peoples older factory’s because if they where to change a recipe of something where you will get more then the one type of product ...

I like having to deal with empty barrels when you empty the contents of them using a factory. I feel like other mid/late-game products should have waste products that you have to deal with. I feel like this would add a huge opportunity to use(pollute) lakes/land far away from your home base and add ...