Are your office chairs all slowly sinking over time as you sit in them? Once the hydraulic height adjusting mechanism built into most modern office chairs begins to lose its seal those chairs are perpetually lowering themselves gradually throughout the day. The cause of this problem is not a faulty chair. Almost universally this problem is caused by an overweight or heavier than average person seating themselves on the chair time after time. The weight of a person sitting down is far more than their actual weight. Their momentum and speed on seating can actually double or triple force upon the chair.
Considering that most office chairs are built to withstand a 250 pound maximum it becomes impossible for a standard duty chair to hold up over time to when a person who weighs more than that amount is applying triple their weight in force to the chair. For this reason most quality office furniture companies make available on their Internet sales sites extra heavy duty office chairs.