Agar for balls

["Daniel Larsson" <defdac at hotmail_com>]

>I've done this using media for algal culture using agar which has a steady
>rate of diffusion.
>
>This would be good for folks that leave on vacation also.
>
>Mix KNO3, KH2PO4 and Traces. Maybe a GH builder(Same thing except MgSO4 and
>CaCl2). Or Kalkwasser for you salties.
>
>Make into know volume sized balls.

Where do one get Agar online? If someone knows where to get it in
Europe/Nordic countries that's even better.

Also, you forgot the Agar in the "recepie" above. I really don't know
how Agar works, but I guess you mix some portion of Agar and
water + nutrients and let it dry?