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Immediate attack of calcium deposits
on March 23, 2018
Update: This bottle is only 8 oz and makes 2 gallons of dilute ready-to-use solution. When comparing that to some of the other concentrated solutions, its not as good a value. For example, the "Essential Values" cleaner is 16 oz and makes 4 gallons of ready-to-use solution for about the same price. To fairly compare pricing, you need to understand the dilution ratio and know how much total cleaner your bottle will produce. Some gallon-sized products may be already diluted, so beware.
==== Original review follows ====
My ice maker is about 2 years old and never been cleaned. I use a carbon filter on the water, so wasn't expecting calcium deposits, but there was plenty. This descaler dissolved it all in about 1 hour.
I have an EdgeStar IB450SS(P). The recirculation trough holds a little more than a quart. The instructions on the Descaler bottle say 4 oz to a gallon. I made 1 quart with warm water using 1 oz of the chemical, drained out the existing water in the trough, poured in the solution and let it run for two cycles (30 minutes each). At the start, I could feel the scale in the ice mould. By the end, it was slippery. Now my ice harvest works as new.
I should mention that, before I ran the cleaning cycle, I found a THICK (1/8") layer of calcium sediment/crystals in the bottom of the recirculation trough. I dug out what I could with my fingers and then made a 2x strength batch of the cleaner (with very warm water) and let it sit in the trough for about 1 hours. I swirled it with a plastic spoon occasionally. Once that was all dissolved, I drained the trough and ran the 2 30-minutes cycles with a fresh batch (1oz cleaner to 1 quart very warm water).
For the EdgeStar waffle style ice makers, you really get 8 cleanings out of one bottle of chemical, not just 4.
As an aside, I tested this chemical on some of the thick scale I pulled out of the recirculation trough. Just put a little in a glass, poured a few drops on the scale and, fizzzz, it started dissolving it pronto. Good stuff.