Free used eco-complete. So I'd like to bleach it to make sure I don't get anything bad.
I plan on keeping fish and shrimp with the plants. I figured a lot of soaking in water and excess amounts of dechlorinator would work to get rid of all the bleach.
The sun bath sounds like a good idea or even low heat in the oven. Let's say cooler than the boiling point so that any moisture won't make it act like popcorn.
You could use a 10% bleach solution if you wanted to. You would just have to wait and let it dry out completely (bleach evaporates). It would probably take a long time until it was completely dry.