FROG 01-14-3318 Test Strips for Pools and Hot Tubs: Most test strips are designed to test for chlorine levels of conventional sanitizing systems. But FROG isn’t a conventional system. Our bacterial-killing minerals cut the need for chlorine in half. We created FROG® Test Strips to help you dial in the correct low levels in your pool — which can make your Chlorine Cartridge last twice as long.