Custom B5 Microbial Soil Amendment

Custom B5™ Microbial Soil Amendment

soil bacteria

Concentrated Liquid Microbial Soil Amendment

Custom B5™is a highly concentrated microbial soil amendment product. B5 is designed to improve soil conditions by increasing the soils population of beneficial soil bacteria. Custom B5™ contains 5 specifically selected species of beneficial bacteria including Bacillus subtilis.

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The root system is the gateway to growing bigger, healthier plants. Custom B5™, biological soil amendment, helps plants grow healthier root systems.

Benefits of Custom B5

Custom B5™ contains 5 specifically selected species of beneficial soil bacteria. These bacteria have been selected because of their enhanced ability to:

  • Decompose organic matter to create extra nutrition for your plants.
  • Grow bigger, healthier root system enabling the plant to grow larger and more abundant fruits or vegetables.
  • Help produce plant hormones
  • Restore Biotic Balance
  • Process nutrients more effectively
  • Replace beneficial bacteria lost to drought, flooding or freezing.

Custom B5™ is a highly concentrated, liquid microbial product manufactured and distributed by Custom Biologicals.

Custom B5™ contains the following beneficial soil bacteria:

  • Bacillus subtilis
  • Bacillus laterosporus
  • Bacillus licheniformus
  • Bacillus megaterium
  • Bacillus pumilus

Custom B5 is available in two convenient sizes; 50ml and 1 Liter. The 50 ml size contains enough beneficial soil microbes to treat 2.5 acres (1 Hectare). The 1 liter size will treat 50 acres (20 Hectares).

Custom B5 can be purchased in our online store.

Distributor and dealer inquires, both domestic and international, are welcome. 

Custom B5 is also available as a fast dissolving fizzytab. B5 Fizzytabs contains the same beneficial soil bacteria, but in a easy-to-use tablet. Each tablet treats 1/4 acre and cna be applied as a seed treatment or after the plant has germinated.

Custom Biologicals manufactures a wide variety of biological products including products for soil amendment. Contact Custom at (561) 797-3008 or via email at

Microbial soil amendments are sometimes called biofertilizers, biological soil amendments, or beneficial microbe treatments. This product is useful for home and lawn care, gardening, as well as for commercial farms.



  • gill pedwell

    can this product help with soil which contained a palm infected with fusilarium wilt now removed and burnt

    • MrBill

      Gil – Thanks for your inquiry. Our products are primarily for growth promotion. We have worked with Palm Trees with great success. Thanks again. Bill

    • gill pedwell

      How do you recommend applying your product. Do we dilute it with water ? What are the proportions for applying to say an orchard?

  • Peter

    Hi there, i am struggling to understand how there is enough bacteria in 50mls of liquid to cover a Ha? I know it must be diluted and that the bacteria must multiple…. Can you please explain the process.

    • MrBill

      Great question.

      We’re not trying to add enough bacteria to complete the job. We’re trying to add enough bacteria to start the job. Remember that bacteria are alive and multiply very rapidly. Under ideal conditions they can multiply as fast as every 20 minutes. Our bacterial and fungal products are essentially seeds. We count on the microbes growing, multiplying and thriving in the soil.

      As for the numbers, B5 has 1 x 10(8) bacteria per ml. This is 100,000,000 per milliliter. For the 50 ml bottle this means 5,000,000,000 or 5 billion bacteria. This is more than enough bacteria to colonize one hectare of farmland.


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