Many chemical drain openers are made of highly caustic chemicals, (sodium hydroxide) which “burn” a hole through the blockage, these products can physically damage plumbing and have a very negative effect on the vital biological treatment going on within the septic tank.
Bacteriological drain cleaners, such as EcoEthic Septic & Drain Treatment, are both effective at cleaning the drain and beneficial to your septic system. Use a natural choice whenever possible.