1. C LEAN W ATER 4 A LL Revolutionizing the way you view dirt.

2. Filter Design Bad Water Good Water Bad Water (Pressurized) D.E. Gravity Driven Slurry System Pressurized Sintered System

3. Slurry Progress Diatomaceous Earth Food Grade is too fine (<20 μm) Ordered pool grade, waiting for delivery. Sintering Progress We learned to make green bodies (un-sintered desired shape). And made several samples.

4. Sintering Progress Sintering Samples Temperature [°C] Time [min] 50030 50060 40030 40060 35030 30030 Videos Preliminary Flow Tests Used 500 °C, 30 minute sample Flow rate ~0.6 mL/min

5. Scanning Electron Microscopy General Observations: Avg diatom size ~ 10 μm Avg pore size <1 μm Predominantly 1 type of organism (hair curler shape)- green algae? Not much visible difference between non-sintered and sintered samples

6. Sintering Effects Tried to see sinter neck in 500°C sintered sample, but couldn’t get a clear, magnified image

7. Sintering at Higher Temperatures Sintering at higher T causes denser packing

8. Sintering for longer times No striking difference between sintered sample for 30mins vs. 1 hour

9. Elemental Analysis Confirmed elements in diatomaceous earth: mostly silica

10. Next Up: Learn to Sinter Filter Grade DE Perform Sinter Temperature & time vs. Flow rate tests Perform Pressurized Flow Tests Slurry Flow rate Micro-sphere filtering testing

11. Sintering Tests: Filter Grade: More crystalline? Higher temperature sinter? Sinter Parameters vs. Flow: How does Temperature and time effect porosity and flow rate?

12. Flow Testing: Crank up the Pressure: Construct pressurized system and determine flow at 40 to 60 psi: where the pro’s do it Slurry II: Initial slurry system failed due to small particle size Revisit this method with filter grade Filtering Verification: Acquire proper solute particles to test filtering ability

13. Summary So far… Made green bodies and sintered Preliminary flow rate tests SEM imaging of samples Elemental analysis of food grade Next Steps Find optimal sintering temperature Measure flow rates more accurately Design pressurized system Wear testing Use solute particles to test filter ability Questions?