Q. The permanent hardness can be removed by adding lime and soda.

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Q. The time required for the mixing of lime and soda in lime soda process is _____________

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Q. The temperature at which the softening of water takes place by lime soda process is ____________

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Q. Which chemical is used for removing the permanent hardness of Calcium chloride?

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Q. Softening chemicals, lime and soda do not depend on ____________

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Q. The detention period of a lime soda treatment plant is ____________

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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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