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What is the type of filter used in the septic tank when the rate of percolation is 90 minutes?

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What is the type of filter used in the septic tank when the rate of percolation is 90 minutes?

(a) Slow sand filter

(b) Rapid sand filter

(c) Biological filter

(d) Trickling filter

I got this question in an interview.

I'm obligated to ask this question of Construction of Septic Tank topic in division Solid Waste Management, Aerobic & Anaerobic Stabilization Units of Environmental Engineering

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Correct choice is (c) Biological filter

Explanation: Biological filters are used in a septic tank for the treatment of sewage when the percolation rate is >60minutes. The percolation rate is the rate at which water flows through the soil.

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