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QwikDescaler+ Concentrated Descaler Solution – 1 Quart Using a high-quality, safe descaling solution like this one is a great way to keep your tankless water heater working efficiently and prevent buildup from prematurely wearing down your unit. If they’re not flushed once a year, they’ll start to develop things like water scale, lime, rust, and other water-formed mineral deposits. This safe, multipurpose solution will keep the water heater clean and working optimally, so you can avoid bigger, more costly situations. Unique Color-Indicating Chemistry The innovative color indicating chemistry saves a lot of time. At working strength, the descaling solution will appear reddish. When the descaling solution is exhausted and no longer working, it turns yellowish, indicating that more QwikDescaler+ should be added. The system is clean when the reddish color is retained for 10 minutes. This takes all of the guesswork out of flushing your system.