Performance Media for Water Filtration

GreansendPlus™ 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 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 has the WQA Gold Seal Certification for com­pliance with NSF/ANSI 61 Packaging is available in 1/2 cubic foot bags or 1 metric ton (2,205 Ibs) bulk sacks.




Bed Type

Dual media: antracite (15-36 in.) and Greensand (15-24 in.)


700-1200 grains of oxidized iron and manga­nese/sq.ft. of bed area based on potassium permanganate demand and operation to iron break through.


Sufficient rate using treated water to produce 40% bed expansion.

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 3-5 minutes or until effluent is acceptable.

Flow Rate

Recommended flow rates with CR operation are 2-5 gpm/sq. ft. Extremely high concentra­tions of iron and manganese usually require.

Flow Rate (Cont.)

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.

The run length between backwashes can be estimated as follows:
What is the run length for a water containing 1.7 mg/L iron and 0.3 mg/L manganese at a 4 gpm/sq. ft. operating rate?

KMn0q demand = (1 x mg/L Fe) + (2 x mg/L Mn)
= (1 x 1.7) + (2×0.3)
= (2.3 mg/L or 2.3/17.1 = 0.13
grains/gal. gpg)

At 1,000 grains/sq. ft. loading    0.13 gpg = 7.692 gal./sq.ft
At 4 gpm/sq. ft. service rate 7,692/4 = 1,923 min.

The backwash frequency is approximately every 30-36 hours of actual operation.
The Intermittent regeneration (IR) operation is available for certain applications. Contact your Inversand representative for additional information



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.


Physical form

Black, nodular granules shipped In a dry form

Apparent density

85 pounds per cubic foot net

Shipping weight

89 pounds per cubic foot gross

Specific gravity

Approximately 2.4


Approximately 0.45

Screen grading

(dry) 18 X 60 mesh

Effective size

0.30 to 0.35 mm

Uniformity coefficient

Less than 1.80

pH range

5.2-8,5 (sae General Notes)

Maximum temperature

No limit

Backwash rate

Minimum 12 gpm/sq. ft. at 5…F

Service flow rate

2 -5 gpm/sq. ft.

Minimum bed depth

24 inches (15-18 in. of each media or dual media beds)



GreensandPlus: Continuous Regeneration (CR)

Continuous regeneration (CR) operation is recommended in applications where Iron removal is the main objective in well waters with or without the presence of manganese. This method involves the feeding of a prede­termined amount of chlorine (Cl2) and /or potassium permanganate (KMn04), directly to the raw water before the GreensandPlus Filter.
Chlorine should be fed at least 16-20 seconds upstream of the KMn04, or as far upstream as possible to insure adequate contact time. KMn04, if required, should be fed to produce e just pink color in the filter inlet. This slight excess of KMn04 or a Cl2 residual carried through the filter will maintain GreensandPlus in a continuously regenerated condition.

The dosage of Cl2 and KMn04 may be esti­mated as follows:
mg/L Cl2    = mg/L Fe
mg/L KMn04= (0.2 x mg/L Fe) + (2 x mg/LMn)

For operation using only CI2 the demand can be estimated as follows:
Mg/L CI2 = (1 x mg/L Fe) + (3 x mg/LMn)

Removing Fines and Initial Conditioning

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 with a solution of potas­sium permanganate contacting the bed for a minimum of 4 hours. A regeneration level of 4 ounces of KMn04 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.

Radium and Arsenic Removal Using GreensandPlus

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.


Part No. Description Cu. Ft./Bag Wt./Cu. Ft.* Bags/Pallet Weight/Pallet Pallet Dimensions

A8021-01 Calcite .55 (50 lbs.) 90 lbs. 50 2550 lbs. 48” x 36” x 40”

* Weight per cubic foot is approximate.