what is the difference between (a) “andersons charx” with humic acid/biochar and … (b) “andersons humichar” also with same humic acid/biochar ?

Nothing one is e-commerce/consumer sku humichar the the other one is the Pro sku

how many square feet does this bag cover?

10,000 to 40,000 sq ft. from High to Low rate.

What is the percentage of carbon and humic acid?

You're kidding right? In the product description it says: About this item HumiChar is an organic, carbon-based soil amendment containing 50% high-quality humic acid and 50% granulated biochar -- Provides the benefit of quickly-available humic acid and the long-term soil building qualities of the biochar that lasts for decades

What is the shelf life for this product? I have a smaller lawn so might use this for 2-3 years. Will it stay good?

Doc's says it will last, unused, for years. I also have a small lawn, only 3200 sqft. I break it down into two applications about 6 to 8 weeks apart. Don't forget the recommended application of chicken feed.

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The Andersons HumiChar Organic Soil Amendment with Humic Acid and Biochar Covers 12,000 sq ft (12 lb)

The Andersons HumiChar Organic Soil Amendment with Humic Acid and Biochar Covers 12,000 sq ft (12 lb)

Product ID: 347519289

Details

Brand
The Andersons
Item Weight
12 pounds
Style
Modern
UPC
031865325212
Unit Count
192 Ounce

⚡DG Technology for fast, efficient nutrient release

🌱30% Humic Acid for rapid nutrient uptake

🔥43% Granulated Biochar for long-term soil vitality

R5300

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Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌿 Transform your soil, transform your world.

DECADES OF SOIL POWER - 43% biochar content locks in carbon and enriches soil structure for years to come.
BOOST YOUR SOILS IQ - Harness 30% premium humic acid to supercharge nutrient absorption and plant growth.
COVER MORE WASTE LESS - 12 lb pack treats up to 12,000 sq ft—perfect for expansive lawns and gardens craving vitality.
ECO CHIC OMRI CERTIFIED - Organic, environmentally friendly formula that fits seamlessly into any fertilizer routine.
NEXT GEN NUTRIENT DELIVERY - Patented DG Technology ensures ultra-efficient, low-dust application and rapid breakdown.

The Andersons HumiChar is a cutting-edge organic soil amendment combining 30% humic acid and 43% granulated biochar, enhanced with patented DG Technology for rapid nutrient release and long-term soil health. OMRI listed and eco-friendly, it covers up to 12,000 sq ft, making it an essential upgrade for professional-grade lawn and garden care.

Specifications

ASIN	B08ZBGQNJ7
Best Sellers Rank	#4,575 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #88 in Garden Soil
Brand Name	The Andersons
Customer Reviews	4.7 4.7 out of 5 stars (4,131)
Item Weight	12 pounds
Manufacturer	The Andersons
Manufacturer Part Number	1
Model Number	12
Style Name	Modern
UPC	031865325212
Unit Count	192 Ounce
Volume	12 liters

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R5300

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Africa.

Secure transaction

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