SD Aquatics

Found this thread after a mini shock with all my outdoor tubs showing 3.0 chlorine on the aquarium co-op test strips. I was in a bit of a panic wondering what was going on, (did prime degrade somehow and not work was a thought running through my head...) I repeated multiple tests indoor and outdoor, pre-treatment and post-treatment with prime, straight from the tap, and covering the test strip vs exposing to sunlight. Thank you chemistry degree coming in handy... I can confirm that the same exact water sample (confirmed with 0 chlorine) will show 0 chlorine on the aquarium co-op test strip when covered, and 3.0 chlorine when exposed to sunlight (can even happen in the shade, doesn't have to be direct sunlight). For what it's worth, none of the other squares showed variation with/without sunlight exposure. I agree @Coryand the team should consider adding a note to the label that chlorine levels may appear to be falsely elevated if the test strip is exposed to sunlight and recommend that the test strip be covered for the 60 second waiting period or done inside.