Oviedo 8th grader creates gel to combat harmful algal blooms. BY Rachael Krause Seminole County. PUBLISHED 1:52 PM ET Aug. 06, 2021 PUBLISHED 1:52 PM EDT Aug. 06, 2021. SHARE. OVIEDO, Fla.

“Combat Gel does the same thing. You can get it from Walmart,” one wrote. Advertisement. Another said, “Facts I used one tube and been insect free for 3 summers today. ...