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SAPP (Sodium Acid Pyrophosphate) (Na₂H₂P₂O₇) is widely used in industrial processes as a cleaner and dispersant.

SAPP is used as a strong deflocculant (thinner) in fresh water mud systems. It is commonly used in the dispersion of mud rings when water drilling and as a rapid thinner prior to cementing casing.

In water drilling applications normally add one viscosity cup full of SAPP directly into the drill pipe at each connection. In areas with very reactive clays increased treatments will be required. When using to thin the mud prior to cementing, mix as required to the circulating mud system.

In cementing applications, SAPP is used for two main purposes: 

Slurry properties such as fluid loss, thickening time and viscosity can be modified by contamination with drilling mud. SAPP is used in spacers to disperse and displace drilling muds to avoid cement contamination. 

Solids carrying fluid or drilling mud must be removed from the perforation channels and the rock face to allow a good cement bond and complete fill up of the voids. The incorporation of SAPP into the spacer will help remove residual muds and provide a cleaner surface to which the cement can bond.