The first filtration stage occurs when the water flows through the proven BOROUX Foundation™ Black activated carbon filters. The BOROUX Proactive™ Fluoride filter is screwed onto the stem of the BOROUX Foundation™ Black filter and secured in place. The second filtration stage occurs when the water flows through the dual-action BOROUX Proactive™ Fluoride filter.
After the water has passed through the filters in the upper chamber, it first comes into contact with the inner layer of the highly efficient granulated carbon filters in the lower chamber. The water then filters through the patented nanocarbon outer layer. Thanks to the patented Upflow design of the stainless steel housing, the water remains in contact with the outer layer for an extended period, ensuring superior filtration. The filtered water exits the housing through the outlet holes at the top. This ensures virtually uniform use of the entire surface of the fluoride filters, from bottom to top.