I would also consider switching back to the P&G chemical treatment I planned to use but couldn’t due to a lack of supply. And it was difficult to differentiate between particulates and air bubbles trapped within the microscope slide. I couldn’t make out any live bacteria in any of my samples. I would use a better quality microscope and laboratory-grade equipment to ensure more accurate results. To improve the experiment for the future, I would change some things. The physical filters performed much better, with the Sawyer and MSR units averaging 1.2 and 2.8 particulates respectively. As my microscope didn’t see any bacteria, I can’t attest to its sterilization ability. It is worth noting that the Coleman treatment is designed to kill bacteria, not remove particulates, so this was somewhat expected. The control had an average of 10 particulates per slide while the Coleman chemical treatment had an average of 9.4 particulates per slide. However, I was surprised to see that the cheaper physical filter (the Sawyer Mini ~$30) performed better than the MSR filter (~$90). The physical filters performed the best overall on average while the chemical treatment did not remove particles from the water significantly. Interestingly, no bacteria were visible using my microscope, this could simply be because there was no bacteria on the slides or that my microscope failed to view them. Overall, the results were roughly what I would have predicted.
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