1 A do-it-yourself approach for basic basement steps starts around $250-$350 for materials, and takes about 3-4 hours. 2  That's with standard lumber, such as pine; costs can go much higher with more expensive wood, such as oak.
Pour enough melted agar into each sterile plastic petri dish to cover the bottom - about 1/8 to 1/4 deep. Replace the lid immediately. Place agar plates on a counter top to cool and set. Agar medium will set like stiff gelatin at room temperature. The agar medium is now ready for storage or use.
Both of the recipes above will follow the same process. 1  Add all ingredients minus the agar agar to a blender. 2  Bring four cups of water to a simmer in a large pot. 3  In small spoonfuls, add the blended mixture to simmering agar agar.  Stir well until all the mixture has been added.