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  6. Bottom sediment improvement agent 'Clear Water' for marine aquaculture also suppresses red tide.

Bottom sediment improvement agent 'Clear Water' for marine aquaculture also suppresses red tide.

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last updated:Apr 27, 2026

宇部マテリアルズ 東京本部
宇部マテリアルズ 東京本部
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The main component is a seawater-derived magnesium ingredient with high safety! It is used to prevent damage caused by hydrogen sulfide, fish diseases, and red tide due to sediment deterioration.

By applying the sediment improvement agent "Clear Water," the sediment is kept alkaline, promoting the decomposition of sludge. It also suppresses the generation of hydrogen sulfide, contributing to the cultivation of healthy fish without stress. This product is primarily composed of magnesium extracted from seawater, making it highly safe for fish. The effectiveness of suppressing hydrogen sulfide and reducing benthic organisms has been confirmed by the Ministry of the Environment's ETV program. ★Usage locations: Sea surface and land-based aquaculture farms, seedling centers, rivers, lakes, and more. ★User testimonials are available on our company website. 【Features】 ◆Weakly alkaline: Maintains a weakly alkaline pH of around 9 to 10. ◆Long-lasting effect: Slowly dissolves in water, providing sustained effectiveness. ◆High safety: Confirmed safety through safety tests (OECD standards, etc.). ◆No equipment needed: Can be applied directly from above the tank without interrupting aquaculture. 【Mechanism】 ■Suppresses the activity of sulfate-reducing bacteria, which are the cause of hydrogen sulfide generation, by maintaining a weakly alkaline environment. ■Maintains a pH conducive to the activity of organisms that decompose sludge, promoting sludge decomposition. *For more details, please contact our company.

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Bottom sediment improvement agent 'Clear Water' for marine aquaculture also suppresses red tide.

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  • 2.底質BeforeAfter写真.jpg

    Comparison of bottom sediments before and after Clearwater application

  • 4.ETVロゴマーク.jpg

    ETV business and its results

  • 5.全硫化物グラフ.jpg

    Graph of the transition of total sulfide values

  • 安全性.jpg

    Features of Clearwater

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宇部マテリアルズ

宇部マテリアルズ 東京本部

Building materials, supplies and fixtures manufacturers

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Ube Materials Corporation is a manufacturer of specialty inorganic materials based in Ube City, Yamaguchi Prefecture. Using limestone, which is abundantly produced in Mine City, as raw material, the company produces calcium-related products such as quicklime and hydrated lime, as well as extracting magnesium from seawater using quicklime as a raw material to manufacture products like magnesium hydroxide and magnesia clinker (refractory material). Additionally, as a unique business, the company has developed a healthcare division that directly serves consumers by selling lime as a dehumidifying agent, and now offers products such as toothpaste, bath cosmetics, and other cosmetics through co-ops, mass retailers, mail order, and online sales.

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