(10) Roebic K-87-Q 32oz SGP Soap, Grease & Paper Digester Drain Septic Tank Cleaner K-87 SGP Soap, Grease & Paper Digester SGP is specially formulated to break down soap, grease and paper. K-87 contains Roebic's proprietary bacterial cultures capable of breaking down these hard to break down products. Adding SGP to your system will fortify the bacteria in your system and help ensure smooth septic system operations. Note: This product cannot be shipped to the state of Massachusetts.