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Filtration – What You Need To Know

We all know if you want to produce the most yield, ensure your crops are fed correctly. This doesn’t just mean having the best quality pipe or sprinkler, if your water isn’t up to scratch then nor will the rest of the system.

The water used in most irrigation systems can contain contaminants such as silt, sand, algae and other decaying organic matter. Depending on the type of irrigation system being used, the level of filtration required changes. An example of this being Drip Irrigation, as it needs much finer filtration than compared to spray irrigation, to prevent blockage.


Manual filters require regular user inspection and cleaning. Some manual filters are fitted with a brush or scanner assembly which allows them to be cleaned without disassembling.


Automatic Filters are fitted with a timer and a pressure differential switch. When the pressure differential reaches a pre-set value, the filter goes into a backflush cycle and cleans itself. This type of filter would primarily be used for automatic irrigation systems.

Sand Filter

Sand filters are suitable for both inorganic and organic contaminants. They are tanks filled with sand or gravel media. Water passes through the bed of media and particles are trapped. Sand filters offer a much bigger surface area and as such can usually provide an effective filtration within the water velocity recommendations of the manufacturer. Cleaning is achieved by reversing the flow of water through the tank to lift and separate the sand. Trapped contaminants are purged to waste as the water flows through.

Screen Filter

These are the least expensive and most common filters. They work well removing sand from water, due to the very fine stainless-steel mesh that traps particles. In situations when you need to remove copious amounts of organic material from water you have better choices. The organic materials tend to crush on the screen and are hard to remove.

If you would like to enquire about the purchase or maintenance of one of our filters, please call the office on 01925 818499.