Josh's Frogs Charcoal (4 Quarts) can be used in a variety of ways: <br> <br> <b>Springtail Culturing:</b> This 4 Quart bag of charcoal is enough to start a shoe box sized Springtail culture. Charcoal is the ideal substrate for culturing Springtails. This high-quality horticultural charcoal offered by Josh's Frogs provides plenty of surface area that Springtails need to reproduce and thrive. Charcoal also reduces odors and makes harvesting Springtails simple and easy - just add water and pour out the excess water and Springtails! <br> <br> <b>Terrarium Uses:</b> Josh’s Frogs Horticultural Charcoal can be used as the second layer in the terrarium substrate. It acts as a filter and keeps the terrarium fresh due to its odor-reducing capabilities. Only a thin layer of charcoal is needed to cover the drainage layer, about half the amount of the drainage layer. <br> <br> <b> Horticultural Uses:</b> Charcoal can also be used as a substrate additive to increase drainage and aeration of plants. Often, quality horticultural charcoal is added to a potting mix to increase drainage abilities of soil while holding on to moisture and nitrogen, which stays present in a usable form in the root zone of your plants. Horticultural charcoal is also lightweight, reducing the final weight of the potting mix, and aids in maintaining air spaces in the substrate. Charcoal is often incorporated into Orchid and Bromeliad mixes. <br><br> Note: This is not activated charcoal