Can you use Drano with a septic tank?
== == According to Drano all of there products are safe for septic systems.
Will Drano® products harm my septic system?
No, all Drano® products are safe for septic systems and will not harm the bacterial action in septic systems. Follow the package instructions for the right amount of product to use.
Although claims are often made that commercial cleaners are safe for Septic Systems, a scientist from the National Environmental Services Center that we interviewed recently disagrees: "Using commercial chemical drain openers to unclog drains is not recommended for homes that are on septic systems."
For more information see: http://www.septicsystem.com/can-i-use-drano.html