| Bulk Density | 88 lbs./cu. ft. net |
| Effective Size | 0.30 to 0.35 mm |
| Uniformity Coefficient | Less than 1.60 |
| Specific Gravity | Approximately 2.4 |
| Porosity | Approximately 0.45 |
| Screen Grading | 18 X 60 mesh |
| Color | Black |
| Water pH Range | 6.2-8.5 Raw waters having natural pH of 6.2 or above can be filtered through GreensandPlus™ without pH correction. Raw waters with a pH lower than 6.2 should be pH-corrected to 6.5- 6.8 before filtration. Additional alkali should be added following the filters if a pH higher than 6.5-6.8 is desired in the treated water. This prevents the possible adverse reaction and formation of a colloidal precipitate that sometimes occurs with iron and alkali at a pH above 6.8. |
| Maximum Water Temperature | No limit |
| Bed | Dual media: anthracite 15-18 in. and GreensandPlus 15-24 in. |
| Minimum Bed Depth | 15 inches of each media for dual media beds or 30 inches of GreensandPlus alone |
| Service Flow Rate | 2 – 12 gpm/sq. ft. Extremely high concentrations of iron and manganese usually require lower flow rates for equivalent run lengths. Higher flow rates can be considered with very low concentrations of iron and manganese. For optimizing design parameters, pilot plant testing is recommended. The run length between backwashes can be estimated as follows: The run length for a water containing 1.7 mg/L iron and 0.3 mg/L manganese at a 4 gpm/sq. ft. service rate: Contaminant loading (1 x mg/L Fe) + (2 x mg/L Mn) = (1 x 1.7) + (2 x 0.3) = (2.3 mg/L or 2.3/17.1 = 0.13 grains/gal. (gpg) At 1,200 grains / sq. ft. loading ÷ 0.13 gpg = 9,230 gal./sq. ft. At 4 gpm / sq. ft. service rate 9,230/4 = 2,307 min. The backwash frequency is approximately every 32-38 hours of actual operation. |
| Backwash Flow Rate | Minimum 12 gpm/sq. ft. at 55ºF (see expansion chart) Sufficient rate using treated water to produce 40% bed expansion for 8 minutes or until wastewater is clear. |
| Capacity | 700-1200 grains of oxidized iron and manganese / sq.ft. of bed area based on oxidant demand and operation to iron break through or dp limitations. |
| Air/Water Scour | Optional using 0.8-2.0 cfm/sq. ft. with a simultaneous treated water backwash at 4.0-4.5 gpm/sq. ft. |
| Raw Water Rinse | At normal service flow rate for 3 minutes or until effluent is acceptable. |
EQPT offer feature unique technological solutions, with several of them being patented. Our products combine proven modern technologies and enable water quality control through the use of digitalization
