Habitats that need the most control are often the most undesirable and difficult to treat. So you'll be pleased to learn that a single application of ALTOSID XR-Briquets offers up to 150 days of control. Like ALTOSID 30-Day Briquets, XR Briquets require no expensive application equipment, and can be used for pre-treatment before the wet season. That means you're better able to treat hard-to-access or out-lying areas, and can eliminate the additional costs associated with travel and multiple re-treatments. Altosid XR Briquets are available in an "ingot" shape for easier application. This "ingot" shape (3 1/8" L x 1" H x 1 1/8" W) is narrower and longer than the existing "cork" shape, allowing the product to fit through virtually any storm drain or sewer without the need for lifting the grate. Now, Altosid XR Briquets make application easier and still deliver season-long control of mosquito larvae for up to 150 days.