Water Filtration System

Water Filtration Systems

Nancrede Engineering’s line of catalogued vertical pressure filters offers the most complete range of sizes and filter media available. All units automatically backwash and rinse on a periodic time clock basis in order to cleanse and reclassify the filter media. Sediment filters incur an increased pressure loss from inlet to outlet as filtered particles collect in the bed. As an option, these filters can be furnished to backwash and rinse on a preset pressure loss basis. The M series (manganese greensand) filters require a periodic regeneration in order to function properly. An optional regenerate system is available to facilitate regeneration.

Water Filter Types

Industrial water filtration system - triple 54 inch skid mounted

• ‘MID’ Commercial and Industrial Multi-Media Water Filters – (Also know as Multi-layer, or ML Filters) High efficiency, in-depth filter system using a layered bed of anthracite, silica sand, and two grades of garnet for excellent filtration down to the order of 5-10 micron. Multi-Media has the highest service flow rates available in a pressure type filter and suitable for final filtration of most city water and well water supplies. Not recommended as the primary filtration means for extremely high turbidity applications.
• ‘AGA’ Filter-AG® Commercial and Industrial Water Filters – General service filter system using a non-hydrous silicon dioxide media for suspended solids removal down to the 20-40 micron range. The fractured edges and irregular surface of the media creates less pressure drop by allowing deeper sediment penetration without caking and blinding the bed surface. Filter-Ag has a lighter weight than traditional sand media thereby requiring lower backwash rates and thus better water conservation.
• ‘MGA’ Commercial and Industrial Iron Water Filters – Filter system capable of reducing iron, manganese, and hydrogen sulfide using manganese greensand filter media. Manganese greensand is formulated from a glauconite coated with varying types of manganese oxides. Soluble iron, manganese, and hydrogen sulfide are then oxidized and precipitated by contact with these oxides. Precipitates are then filtered and removed by the backwash step. Oxidative capacity of the media must be restored through either periodic regeneration with a weak potassium permanganate (KMnO4) solution or a continuous chemical feed of KMnO4, chlorine, or a combination of both.
• ‘ACA’ Commercial and Industrial Activated Carbon Water Filters – Granular Activated Carbon (GAC) is designed for the reduction of tastes, odors, and dissolved organic material from municipal and industrial water supplies. The most common application is the removal of free chlorine from water supplies as pre-treatment to other water treatment systems such as reverse osmosis. Inlet water to activated carbon systems should be relatively free of turbidity and iron for optimal performance. Numerous types of activated carbon are available for specialty applications.
• ‘ANA’ Commercial and Industrial Neutralization Water Filters – Calcite is a crushed and screened calcium carbonate media used to neutralize acidic or low pH water supplies to a neutral, less corrosive effluent. Acidic waters slowly dissolve the calcium carbonate on contact to raise the pH which reduces the potential leaching of copper and other metals found in piping systems. Media will need to be added periodically as it depletes in the filter vessel. Since the effluent water will increase in calcium level, a water softener may be required after the neutralizing filter.

How To Size a Commercial or Industrial Water Filter

Industrial water filter system - fiberglass triple filter

In addition to service flow, the selection of a filter system must take into account the available backwash flow rate. This is the most important function in the proper operation of a filter. Periodically, the accumulated impurities (iron, sediment, etc.) must be removed (backwashed) from the filter. Backwash flow rates are always much higher than service flow rates and therefore limit the size of filter that can be installed. As a general rule in sizing filters, select the largest filter that can be backwashed with the flow rate available at the point of filter installation, then note the service flow rate for the filter selected. If it is not adequate for the flow to be treated, a twin or triple filter installed in parallel is required. A parallel installation will increase the service flow while permitting each filter to be backwashed separately with the existing water supply.

Water Filter Models

MFG Commercial and Industrial Series Water Filters
MFS Series