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The UltraTech 9873 is the small-format recessed frame configuration of the Ultra-HydroKleen catch basin filter, custom-fitted for catch basins with drain openings between 20" and 25" in diameter. Designed for drains in known high-contaminant "hot spot" locations, the recessed frame seats flush within the catch basin ledge so the unit sits below grade, protecting it from traffic interference while maintaining full filtration performance. As a patented true filter verified by the EPA's ETV program, it forces stormwater through up to three separate filter chambers before discharge — removing hydrocarbons, heavy metals, sediments, phosphorous, nitrogen, and other organics from stormwater and industrial runoff.
- Recessed Frame for Small Catch Basins – Custom-fitted recessed frame seats flush within the catch basin ledge for drain openings between 20" and 25" (508 mm – 635 mm); available for round or square grate configurations with custom sizes available upon request
- True Multi-Stage Filtration – Patented separate-chamber design forces water through up to three different filter media bags before discharge, exceeding 80% sediment removal efficiency and targeting hydrocarbons, heavy metals, phosphorous, and other organics simultaneously
- Mix-and-Match Media Compatibility – Supports Sorb-44 (Part #9462), Activated Carbon (Part #9463), PhosFilter (Part #9461), and Heavy Metal Media (Part #9460); filter media bags are sold separately and must be ordered based on site-specific pollutant profile
- High-Flow Bypass System – Integrated bypass prevents ponding or flooding during high-flow storm events, maintaining full drainage function even when filter media approaches capacity
- Optional Sampling Capability – Compatible with the sampling option (Part #9876), which must be ordered with the unit at time of purchase and cannot be retrofitted; works with the Ultra-Universal Sampler (Part #8247, sold separately) for post-treatment effluent monitoring
Product Specifications:
| Model Number | 9873 |
| Product Type | Ultra-HydroKleen – 20" to 25" Recessed Frame |
| Frame Type | Recessed Frame – Sits Flush Within Catch Basin Ledge |
| Fits Drain Openings | 20" – 25" (508 mm – 635 mm) |
| HydroKleen Body Dimensions | 15" L x 19" W x 19" Deep |
| Flow Rate with Overflow | 135 ft³/min (1,000 gpm) |
| Sediment Removal Efficiency | Exceeds 80% |
| Media Capacity | 2–3 Media Filter Bags (Based on Catch Basin Size) |
| Filter Media | Sold Separately – Part #9462 / #9463 / #9461 / #9460 |
| Grate Compatibility | Round or Square Catch Basin Grates – Custom Sizes Available |
| Bypass System | Yes – Prevents Flooding or Ponding During High-Flow Storm Events |
| Sampling Option | Available – Part #9876 (Must Be Ordered with Unit – Not Retrofittable) |
| Color | Green |
| Recommended Maintenance | Filter Media Replacement Every 6 Months (Varies by Pollutant Load) |
| Compliance | Supports NPDES 40 CFR 122.26 / EPA BMP / TMDL Requirements / EPA ETV Verified |
| UPC | 808416098730 |
| Country of Origin | USA |
| Brand | UltraTech International |