Description: Description: Hydrotech 41400008 fits the following systems: The Hydrotech 41400008 fits Hydrotech HT and HTF Series Reverse Osmosis Systems. The Hydrotech 41400008 fits Hydrotech 101 Series and 103 Series Reverse Osmosis Systems. For 4 stage reverse osmosis systems, the Hydrotech 41400008 water filter is the first filter. For 3 stage systems with a CTA membrane, the Hydrotech 41400008 is the first filter. For 3 stage systems with a TFC membrane, the Hydrotech 41400009 is the correct first filter. Hydrotech 41400008 fits the following systems: The Hydrotech 41400008 fits Hydrotech HT and HTF Series Reverse Osmosis Systems. The Hydrotech 41400008 fits Hydrotech 101 Series and 103 Series Reverse Osmosis Systems. For 4 stage reverse osmosis systems, the Hydrotech 41400008 water filter is the first filter. For 3 stage systems with a CTA membrane, the Hydrotech 41400008 is the first filter. For 3 stage systems with a TFC membrane, the Hydrotech 41400009 is the correct first filter. Technical Information: Retail hydrotech 41400008 hydrotech 41400008 s-fs-02 sediment water filter