At least quarterly, Simmons should be changed in one direction. Specifically, the upper part of the front (the head with the trademark) is used in the first quarter; the lower part of the front is used in the second quarter; the upper and lower parts of the reverse are used in the third and fourth quarters respectively. In this way, Simmons is evenly stressed during use, and the parts tend to be synchronously worn, and the steel wire skeleton is prevented from being damaged due to uneven force.
In the use, Simmons must also be ventilated frequently. Generally, the contents of the bed are removed once every two months, especially during the rainy season.
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