Filtration Media GreensandPlus™ Filtration Media
Manganese Greensand Replacement
GreensandPlus is a black filter media used for removing soluble iron, manganese, hydrogen sulfide, arsenic, and radium from water supplies. The manganese dioxide coated surface of GreensandPlus acts as a catalyst in the oxidation reduction reaction of iron and manganese. The silica sand core of GreensandPlus allows it to withstand operating conditions in waters that are low in silica, TDS, and hardness. When using GreensandPlus, you can eliminate the aluminate feed. GreensandPlus has the WQA Gold Seal Certification for compliance with NSF/ANSI 61.
GreensandPlus is effective at higher operating temperatures and higher differential pressures than ordinary manganese greensand. Tolerance to higher differential pressure can provide for longer run times between backwashes and a greater margin of safety.

Systems may be designed using either vertical or horizontal pressure filters, as well as open gravity filters.

GreensandPlus is a proven technology for iron, manganese, arsenic, radium, and hydrogen sulfide removal. Unlike in-situ treated media, there is no need for extensive preconditioning of filter media or lengthy startup periods, during which required water quality may not be met.

GreensandPlus is an exact replacement for manganese greensand. It can be used in CR or IR applications and requires no changes in backwash rate or times or chemical feeds.

GreensandPlus Pressure Drop Graph
PRESSURE DROP — The graph above shows the expected pressure loss per foot of bed depth as a function of flow rate at various temperatures.
GreensandPlus Backwash Graph
BACKWASH — The graph above shows the expansion characteristics as a function of flow rate at various temperatures.
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 to 6.8 before filtration. Additional alkali should be added following the filters if a pH higher than 6.5 to 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.

The GreensandPlus CR process has been found to be successful in removing radium and arsenic from well water. This occurs via adsorption onto the manganese and/or iron precipitates that are formed. For radium removal, soluble manganese must be present in or added to the raw water for removal to occur. Arsenic removal requires iron to be present in or added to the raw water to accomplish removal. Pilot plant testing is recommended in either case.
  Concurrent treatment of iron, manganese, and
hydrogen sulfide
  Effective over wide pH range  
  High tolerance of oxidizers such as chlorine  
  Low attrition for long bed life  
  Certified to NSF/ANSI Standard 61  
Physical Form Black, nodular granules
(shipped in a dry form)
Apparent Density 85 lb/cu.ft.
Specific Gravity 2.4 approx.
Porosity 0.45 approx.
Screen Grading (Dry) 18 x 60 mesh
Effective Size 0.30 to 0.35 mm
Uniformity Coefficient < 1.60
pH Range 6.2 to 8.5
Maximum Temperature No limit
Minimum Backwash Rate 12 gpm/sq.ft. @ 55ºF
Service Flow Rate 2 to 5 gpm/sq.ft.
Minimum Bed Depth 24 in. (15 to 18 in. of each
media for dual media beds)
Packaging 1/2 cu.ft. bag (44.5 lb) or
1 metric ton (2,205 lb)
Bed Type Dual media: Anthracite 15 to 36 in. and GreensandPlus 15 to 24 in.
Capacity 700 to 1200 grains of oxidized iron and manganese/sq.ft. of bed area based on oxidant demand and operation to iron break through
Backwash Sufficient rate using treated water to produce 40% bed expansion
Air/Water Scour Optional using 0.8 to 2.0 cfm/sq.ft. with a simultaneous treated water backwash at 4.0 to 4.5 gpm/sq.ft.
Raw Water Rinse At normal service flow rate for 3 to 5 minutes or until effluent is acceptable
Flow Rate Recommended flow rates with CR operation are 2 to 5 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 optimum design parameters, pilot plant testing in recommended.
Filter-Ox Comparison Chart
View SWT Filtration Media Guide
Iron Removal Comparison Chart
Prior to placing the anthracite in the filter or placing the filter into service, GreensandPlus should be thoroughly backwashed and the top layer of fine material removed by undercutting in accordance with AWWA B 100, paragraph 4.5.2. This is especially important if anthracite is placed on top of the GreensandPlus bed. Each cubic foot of GreensandPlus shipped contains sufficient material to compensate for the removal of this final material.

GreensandPlus is NOT shipped in a regenerated form; therefore it is necessary, prior to use, to regenerate it contacting the bed for a minimum of 4 hours. A regeneration level of 4 ounces of KMnO or chlorine per cubic foot of GreensandPlus is recommended. Before placing into service, the filter must be rinsed of all remaining traces of potassium permanganate.
This information has been gathered from standard materials and or test data that is believed to be accurate and reliable. Nothing herein shall be determined to be a warranty or representation expressed or implied with respect to the use of such information or the use of the goods described for any particular purpose alone or in combination with other goods or processes, or that their use does not conflict with existing patent rights. No license is granted to practice any patented invention. It is solely for your consideration, investigation and verification.
GreensandPlus™ is a trademark of The Inversand Company.
Safe Water Technologies, Inc.
996 Bluff City Boulevard
Elgin, IL 60120 USA
Telephone: +1.847.888.6900
Facsimile: +1.847.888.6924

Last Updated: March 2, 2022