Does algaecide expire? Reason I ask is that I used a quart of it last year when closing. Bought one of those corny overpriced winterizing kits, not knowing any better.
Previous owners left a bunch of unused chemicals, most of which didn't apply anymore, so I pitched them. I have one gallon of algaecide. I see no expiration on it, like I did on the rest of the chemicals. Does this stuff go bad? I'm guessing it's probably 3 years old, but still unopened.