National Engineers Month

	Activities by Grade	K - 2		5 - 8
		3 - 4		9 - 12

Recycled Water

Reference: Jeff Parkhurst

• Dixie cup (3)

• Pebbles, sand, and gravel of various sizes
  Alternative: can use popcorn or rice too

• Pin

• Poke many holes in the Dixie cup with the pin.

• First place a layer of coarse gravel slightly larger than perforations.

• Next spread a layer (1/2 to 3/4") of gravel and sand.

• In another container mix a quantity of dirty water containing soil, sawdust, etc.

• Pour dirty water through the cup (into a third cup) and allow it to drain into the remaining clean cup.

• What is the advantage to a filter on the city water supply?

• Would this filter take out germs?

• Would stream water always be pure even if it flows through sand and rocks?

• After filtering water what could be done to insure its safety for drinking purposes?