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2. In-tank toilet cleaning tablet - Wikipedia

   en.wikipedia.org/wiki/In-tank_toilet_cleaning_tablet

   In-tank toilet cleaners (also known as toilet water tablets or drop-in toilet bowl cleaners) are tablets or cartridges that add chemicals to toilet tank water to reduce toilet bowl stains. They are commonly used to prevent toilet bowl stains from calcium, limescale, mold, etc. [1] Most contain chlorine bleach as its main active ingredient, [2 ...

3. Iron-oxidizing bacteria - Wikipedia

   en.wikipedia.org/wiki/Iron-oxidizing_bacteria

   Iron filters have been used to treat iron bacteria. Iron filters are similar in appearance and size to conventional water softeners but contain beds of media that have mild oxidizing power. As the iron-bearing water is passed through the bed, any soluble ferrous iron is converted to the insoluble ferric state and then filtered from the water.

4. Toilet cleaner - Wikipedia

   en.wikipedia.org/wiki/Toilet_cleaner

   Usage. Toilet cleaner is sprayed around the rim and into the bowl of the toilet prior to the use of the toilet brush. The toilet brush is used to scrub the toilet, removing stubborn stains and biological debris. In recent times, automatic toilet bowl cleaners that clip onto the rim of the toilet and clean with every flush have also become ...

5. Stain removal hacks you have to see to believe - AOL

   www.aol.com/article/2016/03/30/stain-removal...

   Your favorite shirt may look ruined, but with a little elbow grease and these stain removal secrets, it will be good as new in no time! Your favorite shirt may look ruined, but with a little elbow ...

6. Iron(III) chloride - Wikipedia

   en.wikipedia.org/wiki/Iron(III)_chloride

   Iron(III) chloride is a component of useful stains, such as Carnoy's solution, a histological fixative with many applications. Also, it is used to prepare Verhoeff's stain. Natural occurrence. Like many metal halides, FeCl 3 naturally occurs as a trace mineral.

7. Limescale - Wikipedia

   en.wikipedia.org/wiki/Limescale

   Limescale is a hard, chalky deposit, consisting mainly of calcium carbonate (CaCO 3 ). It often builds up inside kettles, boilers, and pipework, especially that for hot water. It is also often found as a similar deposit on the inner surfaces of old pipes and other surfaces where hard water has flowed. Limescale also forms as travertine or tufa ...