Think tank RAND calculates that even just 1 percentage point difference in annual fees adds up to $3, 380 after 10 years on a $20, 000 account balance.
Working principle: when the internal piping and tank vacuum, atmospheric pressure will be the valve cover, air enters the system, balance the system pressure, eliminate the effect of vacuum.
A dynamic model of clarification-thickening process is introduced based on the solid flux theory and the mass balance of each layer of a one-dimensional settling tank.