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Application Instructions


(All drain field applications are based on a typical septic system with about 200 linear feet of absorption bed.)


Drain field leach field and pit maintenance:

Use 1 gallon every 6 months applied through the toilet, or convenient drain.


For sluggish septic system drain fields:

3 Gallons: 1 gallon per week for 3 weeks applied through a toilet, sink, or convenient drain. Flush thoroughly to aid distribution through the tank and into the drain field.


Failing or sluggish cesspools and seepage pits:

6 Gallons: 3 gallons applied directly to the pit for the first application, then 1 gallon per week for 3 weeks applied through a toilet, sink drain, or preferably, an opening in the pit.


Restoring Percolation to Failed Drain Fields Using a SHOCK Treatment:

Apply at least 4 gallons directly to the drain field soil through a distribution box, cleanout, riser, or tank outlet leading directly to the drain field, bypassing the septic tank. Have the tank pumped the day of the application to relieve back pressure and have the pumper pump until water returning from the field to the tank has stopped running before applying Septic Perc. Follow the application with enough fresh water from a garden hose to push the product deep into the field.

Severely degraded fields, or fields that have flooded can benefit from an application of industrial-grade Mega Bio™ bacteria drain field treatment. See our Combo Shock Treatment,


You may have to dig below the surface of the soil to find your distribution box. If you do not have, or cannot find, a distribution box or cleanout leading directly to the drain field, the product may be applied through the outlet of the septic tank using a funnel with a length of old garden hose attached. See our website for more details.


WARNING: Septic tanks can be hazardous. Poisonous gases collect at the top of the tank, and tank contents pose a health hazard. We recommend hiring a licensed professional septic service technician if the application must be done through the tank’s outlet or “D”box.




EYE: Eye protection such as goggles and a full-face shield should be worn. Contact with the eyes to by-product mist or solution may cause irritation or a burning sensation.


SKIN: Skin protection such as rubber gloves and aprons should be worn to prevent repeated or prolonged contact with liquid or product mist or solution, which may irritate. In case of exposure, wash with soap and water.


INGESTION: May cause gastrointestinal irritation including nausea, vomiting, and diarrhea.


INHALATION: Product mist may irritate the nose, throat, and respiratory tract.


Corrosive to copper and brass.


Not listed as a carcinogen by NTP, IARC, or OSHA. Not regulated by DOT.


It is the end user’s responsibility to conform to all local rules and restrictions when using this product.


Mega Bio’s powdered formula may be used to reduce solids collecting in the septic tank and leach field. It may be applied with Septic Perc for a Shock Treatment, or it may be applied by itself to reduce solids and restore balance to fields that have flooded or failed due to contamination or overgrowth.

To apply with Septic Perc as Shock Treatment: Mix one 8-ounce bag of Mega Bio with 2-3 gallons of warm water. Stir well until the powder dissolves then apply it right after the Septic Perc. Flush the products deeper into the field with fresh water from a garden hose.

For drainage problems: Mix one 8-ounce bag of Mega Bio with 2-3 gallons of warm water then flush down a toilet or sink leading to the septic tank.

Sink Drains, Floor Drains, Shower Drains & Garbage Disposals: Mix 1 Tbsp. of Mega Bio bacteria powder with 2 gallons of warm tap water. Stir well until the powder dissolves. Pour 2 cups of the Mega Bio solution down every sink, floor and shower drain, and garbage disposal. Repeat monthly or as needed to maintain odorless, free-flowing drains.

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