I'll just put plants grow inside it at first and water it. Nothing special! I don't have some much possibilities at the moment. I thought maybe I I'll be able to grow in side it at least half a year. But that's the reason why I need some information about those sponges.
So if somebody has any experiences with growing sponges, please share.
Grow-Tech homepage is
Rapid hydration growing medium for Hydroponics; Grow-Tech and here is some information
http://www.grow-tech.com/pdf/Grow-Tech-Products.pdf
but not prices