[Q] Alternative sb

[f121]

Hi, am trying to understand how this bag work, how the water get in and out but didn't came to an answer.

So how come the water get in and out? :D

Stormbag - Sandbag flood

[freeztar]

They are using crosslinked polyacrylamide. Here's a good description of the chemical and what it does: HowStuffWorks "How do polymer crystals work and why do they absorb so much wate"

 

As the crystals are hydrated they form a gel. The gel stops the flow of water. As the gel loses water, they shrink down to their original small size and are capable of being used many times.

[modest]

One would have to question the wisdom of having a sandbag that floats. Maybe it could be used as a raft when the flood comes :eek:

 

~modest