When a region’s groundwater is critically depleted and its dirt as hard as a frying pan, how do you refill the aquifer? Ask a fifth grader. Actually, ask the fifth and sixth grade combination class at Bakersfield’s Munsey Elementary School taught by Barbara Elrod. Elrod’s students discovered a pretty cool way to both conserve water and recharge aquifers through “grey water.” That’s water from sinks, showers and washing machines. Turns out most of that water has soap in it and soap is a surfactant.