Featured Video: Use of Davidson Pie December 23, 2016 By Cassia Smith Operator Math, Wastewater, Water Treatment calculations, davidson pie, math problems, waste water math, wastewater math, drinking water math, videos 0 What's a holiday season without a little pie? The Davidson Pie might not be very tasty, but it can help you work math problems assisting with chemical addition and process control at both water and wastewater utilities. This 3-minute video explains the construction of the pie and works an example problem using it. For more water and wastewater math help, search our document database using the "Certification/Exam Prep" category filter and the word "math" (without the quote marks) in the keyword filter. Comments are closed.