Cleaners which claim that their "enzymes" will help septic tank digestion have not been found to be effective Bacteria and microorganisms in your septic tank produce their own enzymes and eat only as much as their own enzymes can digest. If your septic tank seems sluggish or overwhelmed, flush a small amount of soil down the drain to replenish the bacteria and microorganisms in your septic tank. Each teaspoon of soil contains hundreds of microorganisms.
Use: Avoid septic tank cleaners containing organic solvents. If you are using a septic tank cleaner that contains lye products or sodium bisulfate, wear gloves, goggles, and a respirator with an organic vapor cartridge to avoid fumes and splashes.
Storage: Store out of the reach of children. If the cleaner is in a glass jar, store it inside a plastic container and clearly label the outside of the container with the contents. Store on a high shelf or in a locked cabinet.
Disposal: Unless the septic tank cleaner is an organic solvent, small amounts of the septic tank cleaner can be flushed down the drain with plenty of water. Organic solvents should be carefully stored until you can dispose of them through a licensed hazardous waste handler or through a professional household hazardous waste collection.
Alternatives: Take preventative measures. Avoid putting items down your sink or toilet that bacteria cannot digest or that disrupt their environment. Undigestible items include grease, fat, hair, cigar and cigarette butts, filters, facial tissues, paper towels, napkins, sanitary napkins, and Band-Aids.