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The easiest way to clean the filter screen is by spraying it with a high-pressure cleaner with clean water. Lay down the filter screen and fasten it (e.g. with a strap to an empty pallet). Use a pressure washer of 100 - 120 bar and spray clean the screen. Always keep a distance of 10 to 20 centimetres to prevent damage to the filter screen. Spray longitudinally along the outside of the screen at an angle of 30 degrees. Then spray from the inside to the outside and again from the outside to the inside.

Mineral deposits of calcium and magnesium carbonate compounds, iron oxides and manganese oxides are more persistent, making them often impossible to remove with water alone. In that case you use an acid treatment. Most of the freely available acids are suitable for cleaning a filter screen. Which medium you choose depends on the type of deposit:

• Citric acid is effective for manganese deposits and the removal of carbonate deposits.
• Phosphoric acids and nitric acids remove limescale deposits and organic compounds.
• Phosphoric acids and oxalic acids are effective for removing iron deposits. 
• Hydrochloric acid is very effective against limescale. 

Dilute the acid to pH 2, or a concentration of about 1% as long as the acid is still effective. Citric acid can be used at a concentration of up to 5%. Place the filter screen in the solution for 10 to 20 minutes.

To remove organic pollution and biofilm, you need to perform a COP cleaning outside the housing. To do this, use sodium hypochlorite or hydrogen peroxide in a concentration of 0.1% and immerse the filter screen here for about 30 minutes. If the filter screen is not clean after that, rinse it with water and clean the filter again outside the housing. This works as follows:

1. Remove all seals from the screen and clean the screen as thoroughly as possible. 
2. Prepare a suitable solution in a container or bucket that is resistant to chemicals. For elongated filter screens it is best to use a piece of PVC tube with a glue-on end cap. 
3. Completely immerse the filter screen for 10 to 20 minutes (depending on the amount and type of contamination).
4. Rinse the screen thoroughly with clean water.
5. Visually inspect the filter screen. If it is not clean, place it again in the solution for 10 to 20 minutes. Stick to this!
6. Rinse the screen thoroughly with clean water and replace the seals. Then place the filter back in the filter housing. 
7. With an automatic filter, first rinse the filter back, then it goes back to normal operation. 

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​​​​Source: Netafim
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