Chemical Expiration

[Ebennett]

I recently relized that my chemicals were about three months expired how long do chemicals go after experation before they start to hurt the tank?

 

[Delapool]

What types of chemicals?

 

[lopo_03]

I would say that these chemicals won't ever "damage" your tank( but rather lose their efficacy over time. Like many medications do when they "expire" it just means they aren't guaranteed to work as well as they did to start with. However if these are supposed to reduce damaging chemicals such as chlorine then it could be dangerous to your fish in the long run