Each group needs:

• Brita water filter and corresponding Brita water pitcher (use a ten 8-ounce cup model Brita water filter in order to hold the necessary amount of water for this lab; $22-27 each; available at https://www.brita.com/products/water-pitchers/everyday/; to run the activity again, re-use the pitchers and buy replacement filters at $8 each)
• Hydrochloric acid (HCl) solution from Sigma Aldrich (0.1 M for $43.40; available at https://www.sigmaaldrich.com/catalog/substance/hydrochloricacidsolution3646764701011?lang=en&region=US)
• 1-liter beaker
• 17 paper cups (30-ounce or ~0.90-liter in volume)
• 17 LaMotte chlorine test strips, 10–200 ppm (a $2.89 vial contains 100 test strips; available at http://www.webstaurantstore.com/fmp-sk-twc-chrome-chlorine-sanitizer-test-strip-tape-100-vial/640CM240.html?gclid=CJfziYqvqbMCFemiPAodrlkAjA)
• tap water
• large bowl, in which to activate filters
• pipette
• duct tape, enough to wrap around and secure the filter lid to the pitcher base
• stopwatch
• safety eye goggles, one per student
• baking soda (sodium bicarbonate powder), 1 box (16-oz, 454 g) to neutralize solutions before disposal
• Remediation Lab Worksheet, one per student