Swapping the HydroLogic PreEvolution KDF Catalytic Carbon Filter
This is the cartridge that goes back into a PreEvolution housing once the media is spent. HydroLogic catalogues it as HGC741701, in place of HL 22096. KDF and catalytic carbon fill a 9.75 by 4.75 in body, the size the trade calls a 10 by 4.5 in big blue. Rated capacity is 7,500 gallons, with up to 99% chlorine reduction along with sulfur, iron, heavy metals, rust and silt.
Getting a Full Run Out of a 10 x 4.5 Replacement Carbon Filter
Nothing on the housing announces when the media is used up. Most growers mark a date or a running gallon count on the lid instead. Well water is the harder duty, since iron and sulfur load the KDF faster than chlorine on its own does. Dissolved solids pass straight through regardless, which is exactly why the RO membrane still sits downstream of this stage.
Key Features
- KDF and catalytic carbon in one body: One cartridge covers chlorine on municipal supplies and iron, sulfur and heavy metals on a well.
- Rated 7,500 gallons: HydroLogic's service figure, which for most gardens works out to one or two changes a year.
- Up to 99% chlorine reduction: Chlorine is what oxidizes an RO membrane, so this is the number that protects the expensive part.
- 10 x 4.5 in big blue format: Drops into the PreEvolution housing with no adapters, measuring 9.75 by 4.75 in on HydroLogic's sheet.
- Direct HL 22096 replacement: Current part HGC741701 supersedes the HL 22096 number still printed on older housings and manuals.
Technical Specifications
| Specification | Value |
|---|---|
| Manufacturer Part | HGC741701 (replaces HL 22096) |
| Media | KDF + catalytic carbon |
| Cartridge Size | 10 in x 4.5 in nominal (9.75 in x 4.75 in actual) |
| Capacity | 7,500 gallons |
| Chlorine Reduction | Up to 99% |
| Also Reduces | Sulfur, iron, heavy metals, rust, silt |
| Compatible System | PreEvolution high capacity pre-filter |
| Weight | 3.64 lbs |