If the enzymatic cleaner doesn't work, or if you suspect a solid object is lodged:
Here is some text that could be used for a product or service related to a "septic tank drain unblocker": septic tank drain unblocker
Before you pour anything down the drain, try physics. 90% of slow drains are caused by a localized clog of hair, soap scum, or lint. If the enzymatic cleaner doesn't work, or if
Grease Management: Scrape plates into the trash rather than rinsing grease down the sink. If the enzymatic cleaner doesn't work
