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Critters Direct
Activated Horticultural Charcoal
Best soil amendment for terrarium builders and indoor plant enthusiasts.
This Activated Horticultural Charcoal is available in fine or medium grades, offering a versatile amendment for various horticultural needs. Activated charcoal is primarily used for its adsorption properties, helping to purify soil and growing media. It is an essential component for creating healthy environments in terrariums, potting mixes, or for general soil conditioning. It is sold in quart or multi-quart quantities.
$12.99
Owner Satisfaction
4.7
/ 5
Category Rank
11
/ 1247
#11 in Soil
Price vs Category Average
-74%
Below average
Part Number
2
/ ACSTWS-
Who it's for
- Terrarium hobbyists maintaining fresh, odor-free displays
- Plant owners struggling with overwatering and root rot
- Indoor gardeners seeking a cleaner, healthier root environment
Who should skip it
- Clean-freaks worried about messy, staining charcoal dust
- Budget-conscious gardeners managing large-scale planting projects
- Botanists prioritizing immediate, high-potency fertilizer absorption
Performance breakdown
Adsorption Capacity
High-grade activation effectively neutralizes toxins and odors in closed environments.
Grade Versatility
Fine and medium options cater to diverse terrarium and potting needs.
Soil Purification
Prevents stagnant water buildup and keeps growing media fresh longer.
Packaging Scalability
Flexible quantity options suit both small terrariums and larger garden projects.
Ease of Integration
Simple to mix into existing soil blends without creating messy dust.
Terrarium Suitability
An essential foundation for maintaining a healthy, balanced micro-ecosystem.
Key Specs
Part Number
ACSTWS-2
Available Grades
Fine and Medium
Available Quantities
1 Quart, 4 Quarts
Features
- Functions as an adsorbent to help purify growing media
- Suitable for use in potting mixes and terrariums
What customers say
The sentiment leans heavily toward satisfaction regarding product quality and overall value. Consumers frequently highlight the superior purity of this activated charcoal, noting its low dust content and consistent particle size, which simplifies use in terrariums and potting mixes. This precision ensures effective drainage and filtration, meeting the needs of serious plant enthusiasts. Given the generous quantity provided, buyers consistently feel they are receiving excellent value for their investment.
Know before you buy
Activated charcoal acts as an adsorbent, meaning it helps trap impurities, toxins, and odors within the soil. This creates a cleaner, healthier environment for root systems and prevents the buildup of harmful bacteria.
Fine grade is typically better for smaller terrariums or as a thin drainage layer, while medium grade works well for larger setups or when mixed directly into bulk potting soil to improve aeration.
No, activated charcoal is not a fertilizer and does not provide nutrients. Its role is strictly to purify the growing medium and improve the overall health of the soil environment.
A common ratio is to incorporate about 5% to 10% charcoal into your potting mix. For terrariums, a thin layer at the bottom is usually sufficient to help filter water and keep the substrate fresh.
While you can technically reuse it, activated charcoal eventually reaches its saturation point where it can no longer adsorb impurities. For the best results, it is recommended to use fresh charcoal when repotting to ensure optimal soil purification.
Still have a question?
Ask Hayley anything about this product before you decide.
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$13