Typically carbon based elements that reduce Arsenic and Fluoride begin to lose that ability rather quickly. Our most recent laboratory testing indicates that the Black Berkey Purification Elements reduce Arsenic and fluoride up to 99.9%. Do the Berkey Fluoride Filter Elements replace the Black Berkey Purification Elements? If the system air locks, then the element(s) should be unscrewed a bit. 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. 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. In other words a small amount of “burping” (spill) is necessary for the elements to perform properly. To solve the lock condition, the post filter needs to be loosened slightly so that enough water can escape to prevent pressure from building up within the post filter element(s). Secondly, a “lock” condition can occur, where upon 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. The only purpose for the screen is to keep the media within the element during shipment. This will not negatively affect the performance of the element. If the elements are screwed on too tight, the screen within the post filter can become damaged. The elements can be adjusted by either turning them more revolutions or less.
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