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The Lennox X6864 Condensate Drain Pan Treatment is an OEM-approved solution formulated to inhibit the growth of algae, mold, mildew, and slime within your Lennox system's condensate drain pan and drain line. Without regular treatment, biological buildup can cause drain line blockages, pan overflow, water damage, and poor indoor air quality. This treatment is a simple preventive measure compatible with Lennox air handlers and cooling systems to keep condensate drainage flowing freely and efficiently.