Formula D-500A & D-500C: Bacteria Supplements for Wastewater Treatment

Challenges like high or variable influent loads and nutrient imbalances can negatively impact treatment efficiency and quality in wastewater systems.

Formula D-500A and D-500C are formulated with microorganisms, surface tension depressants, micronutrients, growth stimulants, broad-spectrum enzyme systems, and penetrants to enhance wastewater treatment performance. They effectively degrade various wastes, including surfactants, solvents, polymer residues, starches, cellulose, FOG, and petroleum hydrocarbons in wastewater treatment plants (WWTPs).

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Formula D-500A/C Features


  • Industrial-strength dry bacteria formulation

  • Formula D-500A - for wastewater treatment plants with GPD over 1 million

  • Formula D-500C - for wastewater treatment plants with GPD under 1 million

  • Biodegradable

  • Contains microorganisms, growth stimulants, broad-spectrum enzymes, surface tension depressants, and penetrants for bioaugmentation in high-temperature wastewater

  • Packaged in convenient, ready-to-use 1/2-lb water-soluble bags

  • Thrives in environments without “free” or dissolved oxygen

  • Environmentally friendly

  • Available in 25-lb pails — D-500A (Product# 143725) and D-500C (Product# 143830)

Formula D-500A/C Benefits


  • Degrades various wastes, including surfactants, solvents, polymer residues, starch, cellulose, FOG, and petroleum hydrocarbons

  • Improves sludge settling and dewatering

  • Reduces hydrogen sulfide

  • Enhances BOD, COD, and TSS removal

  • Controls surface foam and filamentous growth

  • Minimizes odors

  • Reduces total sludge volume


Using Formula D-500A/C


Dosing Schedule:
Flow Rate Initial Dosage Maintenance
Up to 1,000 GPD ½ lb. per day for 3 days ½ lb. per week
Up to 5,000 GPD ½ lb. per day for 3 days 1 lb. per week
Up to 20,000 GPD 5 lbs.* 1 ½ lb. per week
Up to 50,000 GPD 8 lbs.* 2 lb. per week
Up to 250,000 GPD 15 lbs.* ¼lb. per day
Up to 500,00 GPD 25 lbs.* ½lb. per day
Up to 1 MGD 50 lbs.* 1 lb. per day
Up to 5 MGD 50 lbs. per MGD* 1 lb. per MGD per day
Up to 12 MGD 50 lbs. per MGD* ¾ lb. per MGD per day
Up to 100 MGDD 30 lbs. per MGD* ½ lb. per MGD per day
* Spread this initial dosage out over the course of 10 days.

* * Add as regularly as possible. If it is required to miss one day, add that day’s product with the next dosage.

Dosage rate will vary with flow rates, retention times and system variations.

Do not add to the treatment system at a location where toxic or otherwise adverse pH, dissolved oxygen or temperature conditions may exist at peak levels.

For optimal results the wastewater and treatment system should meet the following conditions:
Optimum Minimum
Influent pH 7.0 5.0
Dissolved oxygen, ppm 2.0+ 1.0+
C/N/P ratio 100/10/1 100/5/1
Temperature 30°C (86°F) 10°C (50°F)
Toxic metals, ppm
(E.g., hex., chromium)		 0 0

Storage and Handling:

Storage: Store in a cool, dry place.

Handling: Wash hands thoroughly with warm, soapy water after handling.

See label and SDS for safety information.

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