The pipe gallery is where many of the chemicals used at the plant are added to the process.  The alum storage tanks are located down here, and hold about 7000 gallons per tank.  Carbon is also added as a weighting agent.  However, since carbon is a "dirty" chemical, granular activated carbon is added in the filters.
 

It's time for a little filtration

The filter galley has eight filters, which are all identical.  The filters, as you can see in the picture on the left, utilize gravel and sand for the purpose of removing any remaining turbidity and sediment.  The granular carbon is used here.  About 1 million gallons per day pass through each filter.

The clearwells... looks clean enough for drinking... almost

The water that reaches the clearwells is very clean, because by this point much of the impurities have settled out and been removed.  The only remaining steps after this is some final chemical treatment.
 

Final chemical treatment and monitoring in the lab

The last thing that happens to the water before it is sent out to the people of Easton and its surrounding townships is final chemical treatment.  Chlorine gas is added again, and zinc orthophosphate is also added as a corrosion inhibitor.  Fluoride is added for dental health.
In the laboratory shown at right, the quality of the water leaving the plant is tested.  There are four sample taps to aid in this process:  raw, mixed, filter influent, and filter effluent.  The pH, turbidity (ntu), alkalinity, chlorine residual, and color of the water are monitored.  The pH of the water leaving the plant ranges from about 6.5 to 8.5.  The Easton WTP produces about 6.5 million gallons of water per day.
 

   Finally... the water is drinkable!
 

Finish up your water treatment tour.. click here