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.
Luckily, we've found a relatively simple solution. First, unplug the cooler and remove the water bottle. Then, drain excess water by pressing the two water spigots. Next, remove the top of the water safe and add one teaspoon of vinegar for every one gallon of warm water to the cooler's well. Leave this to soak for five minutes. As the solution is soaking, take a cloth, dip it in the solution and clean the exterior, including the spigots and water safe.