Shock your pool water weekly or as directed by test results to destroy contaminants that cause cloudy water. . (**) Test Free Chlorine before swimming to ensure it does not exceed 4ppm. . Oxi Chlorine-Free Shock Oxidizer. Clorox ® Pool&Spa™ offers a variety of algaecides that keeps water clear by preventing and killing green, mustard & black algae. . All-In-One ® Algae Killer. Follow the steps in the Easy 1-2-3 Pool Care™ Brand System for simple, . Shocking pool water removes organic contaminants resulting in clean, clear water. Sanitizer and Shock; Kills and Prevents all types of pool algae; Kills bacteria; Removes . 6 in 1 shock with algae-killing crystals . All-In-One ® Algae Killer. Aug 1, 2014 - Chlorine can help kill and prevent algae; Clean your filter before adding . in preventing algae growth and is also an effective algae killer. . Be sure to read and follow all label directions when adding chemicals to your pool. May 9, 2014 - A high pH level can prevent the chlorine shock from properly killing the algae. Be sure to test your pH before adjusting, with a fresh and reliable . Aug 16, 2013 - August is the perfect time to discuss algae and how to remove it by shocking the pool with Calcium Hypochlorite – Ca(OCl)2. Chlorine is a . Clorox Pool&Spa Shock Xtra Blue, 12-Pound 33012CLX. +. Clorox Pool&Spa . .88 Prime. CLOROX Pool&Spa Chlorine Stabilizer, 4-Pound 10004CLX. Clorox Pool & Spa Shock Xtra Blue 6 Pack, 6 lbs . This pool algae killer uses a patented non-foaming formula, which keeps it from staining surfaces and makes it safe and suitable for . Always apply chemicals according to label directions. Keep your water blue and clear with Algaecide XtraBlue - the all in one algae killer. This non-foaming, non-staining treatment works fast to treat and.