Expert Forums: Instrumentation and Control Topic: Re: Why is there a discrepancy of solids at sampling points? 4 January 2011 posed by There could be a difference in solids at the two sampling points. Solids tend to accumulate in the bottom unless the tank is agitated. Solids may also accumulate in bends. Have an insight or suggestion? Login or register to post a comment. Login or register to post a comment.