Originally Posted by vaporize
I just got a bottle with white sediment at the bottom, the chemical place told me to just filter it out and the liquid formalin is still good. What's your take on this?
Originally Posted by mp9
one thing of note would be to check if a white sediment paraformaldehyde which is toxic to fish has developed in the bottle of formalin . if it has discard in a responsible manner , formaldehyde is a carcinogen .
Either it is old, was stored in a un-heated warehouse and got too cold, was shipped air and got too cold, or all of the above.
Throw it out or return it.