Scalewatcher 5 Star<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Weatherproof Heavy Duty Extra Power.</li><li>Use instead of a Scalewatcher 3 if unit has to be outside in weather.</li><li>For pipe sized 1/2" to 1 1/2"- All types of pipe-Copper， steel，lead or plastic can be easily treated</li><li>Great for swimming pools! Less maintenance with 35% savings on chlorine usage.</li><li>Tankless water heaters remain scale free.</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41fBNJKxN2L.jpg" noproxy>