A strainer (also known as floor drain cover or floor grating/grate) should always be used all the time to cover up the floor drain.

Essentially a floor drain is a plumbing fixture installed in the floor with the objective of removing water area it. A floor drain usually comes in various shapes for example round, square or rectangular. Ranging from 2 inches to 12 inches, most floor drains are 4 inches in diameter. Usually constructed from material such as metal or plastic, the gradient of the floor near a floor drain is normally sloped to let gravity do its job of draining the water around a floor drain.
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Typically found near washrooms, water heater and the washer areas in residential areas, floor drains could also be spotted near commercial facilities such as basements, toilets, kitchens, refrigerator areas, shower and locker rooms and near swimming pools for commercial areas.
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A strainer (typically referred to as floor drain cover or floor furnace grate grating/grate) should always be used at all times to protect the floor drain.
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The goal of a floor drain cover (floor drain grate) is to ensure objectives like hair and pest are not getting into the floor drain and clog the drains. A properly designed floor drain cover (floor drain grate) always ensure safety to anyone near a floor drain.
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For a selection of floor drain covers (floor traps), take a look at our range of products here: http://www.jonite.us/products/floor-traps