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Water Filtration for Landscape Irrigation

Aviv Vered
RSM, Midwest, Northeast USA and Canada // 24 Jun. 2019
Aviv is a water and soil technical engineer who joined the irrigation team in 2018.


As we approach the irrigation season, we see more and more homeowners, commercial properties, and municipal parks who are using natural water sources for irrigation.

Homeowners with access to a lake, pond, or even a well will prefer to use the free water over paying to use city water for irrigation. When using surface water, it is recommended to install a filter after the pump to protect the irrigation system. Without a filter, the turf will suffer from dryness, bed areas will have a shortage of water, and all of your investments on landscape may be lost.

<< Learn about how to save resources with the Mini Sigma self-cleaning filter for Irrigation >>

How do I choose a filter?

Filters, just like other irrigation devices, can be purchased from your local irrigation supplier. Filters are available as a simple manual plastic filter as small as ¾” inlet/outlet for small zones, or automatic filters from 2”, 3” and 4” to protect the whole system.

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Main filters generally use 130 – 200 micron screen elements, while secondary filters (e.g. drip zones) generally use 100 micron screen elements. It is very important to know the flow rate so your irrigation supplier can provide the correct filter size for your application.

Which filtration grade is right for me?

Screen elements are available between 80 micron (200 mesh) and 500 micron (30 mesh). The screen elements are color coded for easy recognition of the filtration grade.

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How often does the filter need to be cleaned?

The answer depends upon the type of filter:
• Manual filters
• Semi-automatic filters
• Automatic self-cleaning filters

During the summer when a filter is used consistently, the homeowner or irrigation contractor will have to open a manual filter once a week to see if the screen needs to be cleaned.

For the semi-automatic filters, it is easy to know when cleaning is required thanks to the Clogging Indicator Kit (CIK). Semi-automatic filters include a brush or suction-scanner to enable cleaning to be performed without having to open the filter, but still require someone to perform the cleaning function.

Automatic self-cleaning filters do not require any manual work to clean the screen element from debris buildup. Automatic filters will flush periodically based on differential pressure (DP) between the filter inlet and outlet. In addition to saving you time to check and clean the filter, an automatic filter ensures that water continues to flow downstream without interruption.

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How expensive are filters?

Filter prices for each irrigation application can vary widely. A simple manual plastic filter can be as low as $20, while a fully automatic self-cleaning filter could cost $2,500 or more. But installing a filter is highly recommended to protect your investment on the irrigation system, as well as to protect your turf and your flowers.

Where can I buy a filter?

Amiad has a full range of manualsemi-automatic and automatic filters which can be purchased from your local irrigation distributor. For further assistance in determining which filter is ideal for your application, or for assistance in locating an Amiad distributor in the USA / Canada, contact one of Amiad’s Irrigation Sales Managers here.