
- HOME >
- How to enjoy tea
The scale built the inside of kettle is essential for tea
- [2014.10.10] Posted By Akira Hojo
Some of you may be irritated by the scale that is built up in the kettle on the inside. Are not you trying to remove them since it does not look fine? However, it is very important to keep the scale if you wish to enjoy a nice cup of tea.
The scale inside the kettle is built-up as a result of the chemical reaction
Water usually contains Calcium hydrogen carbonate. It is converted into Calcium carbonate if water is boiled. The Calcium hydrogen carbonate has a higher water solubility (16.6 g/100 ml, 20°C), while the calcium carbonate has a very poor water solubility (0.0013 g/100 ml, 25°C). The scale, mainly consists of calcium carbonate, is built-up as a result of the deposition when water is boiled and calcium hydrogen carbonate is converted into water insoluble salt.
Calcium carbonate enhances the body of tea
In fact, calcium carbonate enhances the body of the tea. It also enhances the flavour when the tea is brewed. The taste of water will be totally different if you wash your kettle with citric acid to remove scale. In particular, you may feel less flavour and less sweetness. The taste of tea becomes very narrow and you may probably wonder if the quality of tea has changed. The scale also reduces the dryness of tea. Usually, the taste of tea becomes very dry after removing the scale.
Scale also contains various trace minerals
The main element of scale is calcium carbonate. However, it also holds in various kinds of trace minerals such as iron, magnesium and so on. These minerals are also contributing to the taste of tea just like how the taste of tea is altered when tea is brewed in a clay teapot.
Increasing the body of your water using shell or coral
The calcium carbonates also the main component of shell or coral. Hence, if your water gives less body, you may also place either shell or coral in your water or kettle to boil. It sometimes helps in enhancing the body of the tea. However, the coral or shell is not only composed of the calcium carbonate, but to contain other minerals. You have to be careful since some of the shell or coral does not have good affinity with your clay teapot.
Related Articles
How to get the latest update on HOJO?
1. Follow Twitter, 2. Click "Like" on Facebook, and 3. Subscribe in newsletter. You can have the latest tea news from HOJO.
Subscribe the Newsletter to enjoy the privileges
- You may receive a free sample upon purchase, or you may have the priority to purchase special products. So please remember to subscribe our newsletter as well as the social network.
- New Arrival of Akitsu Mumyoi and Nosaka Rough Clay Teapot
- A wide selection of teaware by Watanabe Tozo, a Sado-based artist of Mumyoi-yaki, has just arrived. This time, …
- Mang Fei Ripe Pu-erh Tea 2023 – Small-Batch Production from a Renowned Region
- Mang Fei Ripe Pu-erh Tea 2023 is now available. This is one of the highest-quality ripe pu-erh teas among our …
NEW ARTICLES
New Arrival of Akitsu Mumyoi and Nosaka Rough Clay Teapot
- A wide selection of teaware by Watanabe Tozo, a Sado-based artist of Mumyoi-yaki, has just arrived. This time, …
Managing Yunnan White Tea — Insights from the Field
- Since March 25, we have been in Yunnan Province, fully engaged in the production of white tea. In this column, …
Mang Fei Ripe Pu-erh Tea 2023 – Small-Batch Production from a Renowned Region
- Mang Fei Ripe Pu-erh Tea 2023 is now available. This is one of the highest-quality ripe pu-erh teas among our …
Yunnan Tea Trends 2025: Insights from the Fields
- Since March 25, we have been in Yunnan Province. We will stay here until May to conduct tea production, packin …
Why Do Some Teas Taste Astringent? Exploring the Causes and Mechanisms of Astringency
- Tea can range from having no noticeable astringency to possessing a very strong one. What causes this astringe …
The Impact of Heat Sources on Tea Flavor
- It is widely recognized that the material of a kettle plays an important role in shaping the taste of water fo …
New Release of Tang Li Shan Ripe Pu-erh Tea 2023
- We have released the 2023 edition of Tang Li Shan Ripe Pu-erh Tea. Tang Li Shan refers to a mountain located o …
The New Release of Dong Shan Raw Pu-erh Tea 2023 and Jasmine Silver Needle
- We have released Dong Shan Raw Pu-erh Tea 2023 and Jasmine Silver Needle. Dong Shan Raw Pu-erh Tea 2023 We hav …
New Release: Da Xue Shan Wild Pu-erh Tea 2023 & 2024
- We have released the 2023 and 2024 editions of Da Xue Shan Wild Raw Pu-erh Tea. The 2023 edition has been aged …
New Release of High Mountain White Tea
- We are pleased to introduce our High Mountain White Tea, sourced from a unique tea garden with two key feature …
Category
- New Arrival at HOJO Online Shop
- Featured Articles
- Newsletter
- Types of Tea
- Origin of Tea
- Teapot and Tea Equipment
- Tea Column
- How to enjoy tea
- Tea Processing
- How to choose quality tea
- Tea constituents and functional effect
- Safety of Tea
- Foods
- Tea Business Operation
- Hobby and Outdoor Activity
- Ranking of Tea
- Video
- FAQ
- Media Release
Profile

- AKIRA HOJO
- I invite you to experience my tea selections.I was born in Nagano, Japan. In university, I studied agricultural chemistry, and I have the master degree in food science. I worked in Japanese food industry for 10 years. I involved in R&D, QC and QA. As a factory manager, I implemented ISO9000 series and managed the factory.
- The Art of Tea Magazine
- We posted the article on “The Art of Tea Magazine No.9, the magazine is published in Taiwan. We featured …
- New Straits Times
- The Malaysian National Newspaper, New Straits Times featured HOJO Tea on 17-Oct-2007.
Shop Info

Address:Lot No. T-215, 3rd Floor, The Gardens Mall, Mid Valley City, Lingkaran Syed Putra, 59200 Kuala Lumpur
Tel: +603-2287-4537
Business Hour: 10am to 10pm