| Product and recycled content | 100% recycled glass granular particles |
| Application | pool filter media for high rate sand filter |
| Location/Date | King County Aquatic Center (Federal Way, WA) Fall, 1998 |
| Project manager/user | Aquatic Systems Supervisor King County Parks (206)296-7643 |
| Architect/Engineer | None |
| General Contractor | None |
| Background, history | Searched to find higher quality, longer lasting, filter media |
| Performance | Less weight per cubic foot; more uniform flow characteristics; less water needed for back wash cycles; Basically, the recycled glass performs better, filters more efficiently, produces clearer water, and requires less water to do the job |
| Source of material | TriVitro Corporation Contact: (425)251-8340 |
| Quantity | 18 tons |
| Cost | Approximately $100 per ton |
| Cost savings or increase | Cost savings for backwash |
| Installation, costs/savings | Similar initial costs |
| Source of extra funds | None |
| Would you buy this product again? | Yes. |
| Why or why not? | Very helpful, cooperative staff |
| Comments | Good product, good people, good pricing These performance improvements will also save the county money in energy costs, water costs, and sewer costs. Based on these trials, King County established a contract with TriVitro for recycled glass sand in 2000. This pool filtration media is being used in several other pools. King County Parks operates 17 pools. |
| Specifications: | |
|---|---|
| VitroClean | made from 100% recycled glass |
| Density | Approx. 80lb./cu.ft (specific gravity 2.5) |
| Coefficient of Uniformity | 1.50 maximum |
| Est. Sphericity | 0.30 - 0.50, Angular to Sub-angular |
| Porosity | 48% |
| Effective Sizes | VF#25N (0.50-0.60) VF#35N (0.35-0.45) |
| Permeability | 4.0 x 10 -1 cm/sec |
| Typical | SiO2 - 73%; Na2O - 14%; CaO - 10%; |
| Analysis: Mg) | <1%; Al2O3 <1%; SO2 <1% |
For more information about this product:
Press release highlighting this project: "King County wins first-ever environmental purchasing award"
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Updated: January, 200
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