Read More Fluidmaster®’s Flush ‘n Sparkle™ Self-Cleaning Toilet System is designed to be a simple and effective hands-free cleaning solution for most any toilet. Here the Flush ‘n Sparkle™ Septic Tank Refill Cartridges are designed to quickly replace old cartridges and fit the Blue, or Bleach Systems. Installation takes only a minute, for continued hassle-free cleaning. The Flush ‘n Sparkle™ Septic Tank Cleaning System puts a powerful Bio Balance® cleaning solution directly into the overflow tube of the flush valve to help maintain your septic tank. No chemicals ever touch the flapper, fill valve, or other tank parts, preventing the damage drop-in tablets normally inflict, leading to deterioration and part malfunction. Relax and let the toilet clean itself. The Flush ‘n Sparkle™ 8202 Cleaning System Refills – Septic Tank offer the same powerful toilet cleaning solution, but in a 2-Pack for up to 6 months of cleaning.