As discussed in previous blog posts, the plugging of emitters by physical, chemical, or biological contaminants can severely impact irrigation uniformity and increase the maintenance requirements for irrigation systems.
Well-designed irrigation systems should include measures that prevent clogging, including reliable filtration.
Filtration types for irrigation systems
Different filter types are available for removing contaminants from irrigation water. They are categorized based on the method they use to filter the water, and include screen filters, disc filters, and sand media filters.
Factors such as water source, type, and amount of contaminants in the water, the design and size of the irrigation system, and required maintenance, need to be taken into account when selecting a proper filtration solution.
In this blog, we will be focusing on screen filtration for irrigation.
What are screen filters?
Screen filters are a common type of filtration used in irrigation applications. They are relatively simple, compact, and cost-effective devices that are available in a wide range of sizes and micron ratings, and require little onsite preparation. They work effectively over a wide range of different water qualities and flows, and are usually made of metal, plastic, or synthetic cloth enclosed in a special housing.
Screen filters are cleaned by flushing them with water or removing the screen and cleaning it manually. Depending on the flush method used, some of them need to be periodically cleaned by hand to remove debris that is not removed by flushing.
There are several flushing methods used to clean screen filters. The simplest uses a filter flush outlet, which is opened while water is running through the filter to wash out collected debris. An enhanced variation of this is the directed-flow flush. With this method (which is the most common in inexpensive filters) the flush outlet is also opened, but the filter is designed so that the flush flow rushes over the screen face to remove the debris (similar to hosing down a driveway with water).
The most effective method of flushing is the focused backwash method, in which the flush water is forced backwards through the screen. This is done either with two side-by-side filters where the clean water from one is used to flush the other, or by creating a vacuuming effect by forcing water backwards through the screen to “suck” the debris from it.
The most effective and efficient type of filters are automatic self-cleaning screen filters that automatically flush debris from the screen using a focused backwash. Requiring minimal manual maintenance and cleaning, this type of screen filter also requires a lot less water for backwashing, leading to significant time and cost savings.
Save water, money, and time with Amiad’s Filtomat filters
Get ready to step into the future with more efficient screen filter technology.
The Filtomat uses 8 times less water for self-cleaning than a sand media system over a typical growing season.
The Filtomat filter arrives fully assembled, does not require a crane for installation, and only incurs minimal installation costs.
A single self-cleaning cycle is 36 times faster than a sand media system.