Eliminate hassle with this self-cleaning toilet system BioBalance septic tank refill pack! Easy-to-install in a minute Fits Flush N’ Sparkle Automatic Toilet Bowl Cleaning System Scrub-free and hands-free cleaning without damaging toilet parts Replace old cartridges with new septic tank specific automatic cleaning cartridges Environmentally friendly cleaning for up to 3 months per cartridge 2-pack of replacement cartridges Clean your septic tank and reduce drain field clogging with bio-action