Formaldehyde Formalin 37% 4 Liters 1 Gallon

Great

Reasonably priced for treating fish

So this stuff is cloudy trash. There's no way that it's just what it says it is. I've used many different formaldehydes over time. And I've noticed something every time I use this particular brand. It's trash. It ruins everything I do with it. It's infuriating and it cost me a fortune. You can't dehydrate it and you can't fix it. It's just cloudy garbage. I'm not going to return it because that wouldn't make sense. But I'm going to just warn other people to realize that this is trash. Perhaps the company could learn to provide decent stuff that's clear like all organic chemicals are supposed to be for the most part. Not cloudy with like a yellow mist inside of it. I would give it zero stars if I could. And it's a shame because it's not the first time I've used it I've bought it a couple times and I didn't realize that it was the cause of all of my problems before. So don't use this stuff for any reason that requires sensitive chemistry. It's a waste of your money. And to the supplier, for shame. This is a shameful product. Get better at what you do because you're not very good at it.