Bleach, in diluted moderation, is safe for septic use. When used as directed, bleach will keep the inside of your home clean while not killing off the bacteria in your septic system. However, because bleach in a powerful, chemical-based antibacterial cleaning agent, you need to be careful that you don't use bleach for every cleaning chore around the house. Borax is a safe alternative to bleach that is septic friendly, but still a powerful cleaner. Similarly, products containing ammonia, as well as pure ammonia, are safe for septic use in moderation. Used properly, ammonia won't kill the bacteria in your septic system, but in excess, ammonia will offset the bacterial balance of your septic system. Products which are absolutely blacklisted from use with your septic system are drain cleaners, like Drano and Liquid Plumber. As some of the most corrosive chemicals found in the house, a key ingredient in these products is sodium hydroxide, or lye. Some even contain sulfuric acid or hydrochloric acid. A much safer, and more effective, method for cleaning plumbing clogs is to snake the effected drains.
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