1 cu. ft. of pre-washed activated coconut charcoal and gravelstone for the Whole House Water Filter. Gravelstone helps to prevent the carbon from entering your house's plumbing.

Replace the carbon in the main filter every 3 years with normal use. For quicker installation, buy the Carbon & Tank.

This item is assembled to order. Due to the special order status, orders for Activated Charcoal and Gravelstone cannot be canceled. Please note that this item may not ship for 1-2 months after your order is placed. If your order includes other items, the other items will be shipped immediately and the Activated Charcoal and Gravelstone will be shipped separately when ready.