Bio-Active Septic Tank Treatment from Walex Products can help reduce solids and restore the population of worker bacteria and enzymes, helping keep septic systems healthy between recommended tank pumping, according to the maker. Monthly application involves flushing one packet down the toilet. It is safe for all plumbing and helps prevent backup and dissolves solids. Each bag contains a one-year supply. 800-338-3155; www.walex.com.