6 month treatment. Septic backups are a costly, ugly, smelly mess. Excess solids in the septic holding tank can build-up and cause unexpected backups and expensive repairs. When a backup happens, sewage and wastewater can enter your home through toilets, sinks and drains. Simply flushing one FulshPAC down your toilet each month can help prevent these costly repairs that are upwards of $6,000. FlushPACS contains fast-acting enzymes that breakdown household waste without damaging plumbing septic tanks. Once in the septic tank, these bacteria and enzymes continue to work to break up waste and reduce tank build-up.Just flush 1 packet down toilet per month to treat. Reduce septic tank build-up. Fast acting enzymes break down waste. Prevent costly septic backups.