Yes.
Hand held is fine, I use inline myself. Inline requires that you cut and install within the tubing in the proper spots.
Here are some instructions and where to buy replacements. It is important to flush the carbon block after installation but before running the system.
Learn how to change out your RO/DI System's sediment, carbon block, and DI resin filter cartridges.
www.bulkreefsupply.com
Why does BRS recommend this? For almost all 4 Stage RODI systems we recommend the BRS 4 Stage Value replacement filter kit. This kit included high quality filter elements including the Purtrex 1 micron sediment filter and BRS Universal Carbon. We would be very wary of using cheap, low quality...
www.bulkreefsupply.com