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LEVEL 1 Tankless Water Heater Scale Prevention. Provides annual protection against costly water heater scaling and sediment build-up. Siliphos Polyphosphate Media prevents water hardness from scaling on flash heating surfaces. A 5-micron filter reduces sediment, which can cause additional scaling throughout the hot water line. The unique micro-fiber filter construction delivers higher filtration efficiency and flow rates. Ideal for indoor and outdoor installations. Features a 3/4” NPT inlet/outlet with a differential filter change gauge for peace-of-mind. (Price subject to change without notice. Check stock before order. Estimated shipping 3-4 weeks)