Consistence describes how easy it is to deform or break up the soil. Consistence is used to determine if the soil contains clay that swells greatly when wet or shrinks greatly when dry (also known as shrink-swell clay). If enough shrink-swell clay is present in the soil, the soil pores swell shut when the soil gets wet. If the pores are closed, the amount of wastewater the soil can accept is near zero. If the water cannot be accepted, it also cannot be properly treated. Installers can also use this information to estimate how susceptible the soil is to smearing or puddling.