Q. The minimum reaction time allowed in the recarbonation basin is ____________

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Q. What is the pH at which recarbonation should be done?

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Q. Which filter is normally used in the lime soda treatment plant?

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Q. What is the detention time of a water softening accelerator?

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Q. The sludge in water softening accelerator is deposited at ____________

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Q. In which process of water softening, ion exchange phenomenon takes place?

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Q. In which process of water softening, the chemicals are added to remove hardness from water?

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Q. Zeolites are complex compound of ____________

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Q. The color of the artificial zeolite permutit is ____________

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Q. Natural zeolite is mainly processed from ____________

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Q. The color of the natural zeolite is ____________

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Q. The chemical formula of Permutit is ____________

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Q. Permutit has an exchange value of ________ grams of hardness per m³ of zeolite.

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Q. The thickness of the layers of filter sand of zeolite softener is ____________

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Q. Which of the following is a disadvantage of the zeolite process?

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Q. The zeolite process is unsuitable for water containing iron and manganese.

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Q. Iron and Manganese are generally present in water supplies as ____________

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Q. What concentration of iron and manganese will cause unpleasant taste and odor of water?

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Q. The presence of Sulfate iron in the water results in ____________

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Q. The reddish tinge in the water is due to the presence of ____________

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