The KROFTA Spray Filter is specifically designed for the filtration of effluents containing from 200 ppm (parts per million) to 5000 ppm of solids. This product uses a fine mesh cloth, with openings from 75-500 microns, as a filter to separate long fibers from clay and filler. The mesh cloth also serves as a safety filter for showers using clarified water. The Krofta Spray Filter is ideally suited to high throughput units as it can handle wide variations of solid content. The Spray Filter's internal shower makes the unit self-cleaning. Common applications for the Spray Filter include fiber fractionation, felt hair recovery, shower nozzle protection, and effluent polishing before or after dissolved air flotation.




Water enters through the inlet pipe on the bottom of the unit and travels up into the distribution header. This header contains numerous extension stems (the number of which vary depending on equipment capacity), each with a nozzle that directs the water in a fan-shaped spray pattern towards the screen. The screen is fastened to a counter-clockwise rotating drum. As the spray hits the screen, the fine fraction (or short fiber) passes through the fabric and is collected and discharged out of the bottom of the unit. The coarse fraction (or long fiber) hits the screen and drops down towards a cone shaped bottom where it too is discharged out of the unit.

• Few moving parts for simple operation.
• No fresh water is required, filtered water can be used in shower.
• Operating pressure of the Spray Filter is generally between 14-18 psi.
• Open, non-clogging cleaning shower nozzles.
• The screen is secured between 2 steel clamps at the top and bottom of the rotating drum.
• A natural fluttering motion aids in keeping the fabric clean and preventing blinding.
• A backwash header periodically sprays either fresh water or fine fraction water in the opposite direction of the process stream to assist in keeping the screen clean.
• The backwash system requires approximately 30 psi to operate properly.
• The selection of the fabric screen is based on the application characteristics such as temperature and PH. Successful applications have used screens ranging in size from 38 microns to 250 microns.
• There are 7 different unit sizes ranging in capacity for 132 gpm to 2000 gpm (gallons per minute).
• All models can be fabricated from 304L or 316 stainless steel.
• All models include at least one access Plexiglas door and a manual rubber wiper to clean the viewing window.
• A wide door facilitates changing of the mesh cloth and affords interior access.
• Inexpensive filter screens.