There is water spilling out on top of my Berkey Fluoride Filter PF-2, near the area where it attaches to the Black Berkey Purification element in my system.

Does this mean it is not working properly or needs to be tightened more?

The elements can be adjusted by either turning them into more revolutions or less. If the elements are screwed on too tight, the screen within the post-filter can become damaged. This will not negatively affect the performance of the element. The only purpose of the screen is to keep the media within the element during shipment. Secondly, a “lock” condition can occur, whereupon the water coming through the element and post-filter will stop flowing into the bottom chamber once the water level reaches the bottom of the post filter. To solve the lock condition, the post-filter needs to be loosened slightly so that enough water can escape preventing pressure from building up within the post-filter element(s). In other words, a small amount of “burping” (spill) is necessary for the elements to perform properly. To obtain optimum flow without a lock condition and to not have excessive water seepage, you can adjust the post filters a bit each way, to reach a proper balance. Again, the number of turns is a guide. If it appears that too much water is seeping between the threads, the post filter can be tightened a bit more, using care to not overt-tighten. If the system air locks, then the element(s) should be unscrewed a bit.