Choosing the right type of irrigation filter for your irrigation system.


Irrigation filters are vital in almost any watering system. Choosing the right type of filter will extend the efficiency of your irrigation system, reduce the need for maintenance and make it last longer.


There are many choices available when it comes to irrigation filters.The four main types of irrigation filters are screen filters, disc filters, media filters and sand separators. Each irrigation filter works in different ways to filter out contaminants. Screen filters use a screen to screen out particles. The size of the holes in the mesh/screen determine what size particles the irrigation filter will filter out. Disc filters use a combination of discs with different grooves on them. As the water moves through, contaminants are trapped in the grooves and removed. Sand and media filters use a bed of sand or gravel to trap impurities.

Think Water Canterbury

Sometimes the need for irrigation filters is undervalued. Every Irrigation system supplies Auckland needs a filter, even if you think your water is very clean. Irrigation filters provide a safety net or insurance policy against unwanted debris entering your irrigation system. They detect debris long before you will and prevent your irrigation system from becoming blocked or damaged.


The most important factor to consider when choosing an irrigation filter is the water source. You need to determine if the water source provides clean or dirty water. By this we mean dirty water is basically untreated, or water that does not come from a treated water source. In New Zealand and areas such as Auckland, Canterbury and Northland, water is treated by the local governing body.


Dirty water requires greater filtering for irrigation purposes, firstly to prevent the irrigation pump from blocking up and secondly to prevent blockages in the delivery, especially in relation to micro drip irrigation. The location of your water filter is also very important. We generally advise the water filter should be located before the manifold and before the water goes through your valves. By filtering the water prior to entry in the system, blockages can be minimised..

When it comes to irrigation filters, size actually does matter. The bigger the surface area of the water filter, the greater the chance of capturing and removing impurities from the water.


Clean water is a little easier to manage and extensive filtration is not necessary. However, it is still a very good idea to include a simple irrigation filter as insurance against blockages.


Other factors to consider when choosing an irrigation filter are the output and ease of cleaning. The output really refers to the emitters and their size. Spray emitters will require less filtration system design Canterbury than drip irrigation emitters. Cleaning is usually straightforward as most filters can be removed for cleaning without having to disassemble the whole head assembly. Inline hose filters are a little trickier to clean and are generally less popular.


Most of us are not experts in irrigation and rely heavily on the advice of irrigation experts. The team at Think Water have a lot of product knowledge about irrigation filters. They know what to look for when choosing an irrigation filter because they are the ones that typically have to fix irrigation systems when the correct irrigation filtration was not installed at the outset. It doesn’t matter if your irrigation system is big or small, the Think Water team will know what irrigation filters are available and which ones will help you deliver a more efficient irrigation system.


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