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Planting, Seeding & Spraying EquipmentSprayer Filtration Maintenance
Most sprayer headaches that look like pump or nozzle trouble start with a dirty filter. A routine of checking and cleaning screens saves time, product and crop.
Key points
- Filters protect your pump, your nozzles and your calibration.
- Know every filter stage on your sprayer and the mesh size your manual specifies.
- Clean at season start, after heavy products and whenever pressure or pattern changes.
- Wear protective gear and never dump rinsate near water or wells.
- Keep spare screens and seals on hand and replace damaged ones.
Why does sprayer filtration matter?
Dirt, rust flakes, undissolved product and bits of hose end up in a spray tank. Without filtering, they plug nozzles, scratch pumps and cause uneven output. An uneven pattern means some of the field gets too little product and some gets too much.
Good filtration protects your pump and your calibration. The pesticide label may also include mixing and cleanout instructions that affect how you handle filters, so read it.
What filters and screens does a sprayer have?
Most sprayers have more than one stage. A tank-fill basket catches debris as you load. A suction strainer protects the pump. A line or pressure filter sits between the pump and the boom. Many nozzles have their own small screens or strainers.
The screens have a mesh size, and the right one depends on the nozzle and product. Nozzle makers and sprayer manufacturers list the mesh to use. Check your manual rather than guessing.
- Fill basket or screen at the tank opening
- Suction strainer ahead of the pump
- Line or pressure filter before the boom
- Nozzle screens or strainers in each body
How often should you clean sprayer filters?
Check them at the start of the season, after every few tanks of heavy or powdered products and any time pressure or pattern changes. Rinse the filters at the end of each spray day if you can, so residue does not dry hard.
There is no single schedule for every sprayer. Follow the manufacturer's recommendation in your manual, and shorten the interval if your water has sediment or you use products known to settle. A hobby sprayer used twice a year still needs a check before each use.
How do you clean a filter properly?
Relieve pressure first and shut off the pump. Wear the protective equipment on the label, because filters hold chemical residue. Remove the screen, rinse it with clean water, and use a soft brush if needed. Avoid wire brushes and sharp tools that can damage the mesh.
Rinse into a safe container or onto a labeled area as the product label allows. Do not dump rinsate in a ditch, near a well or onto the ground near a stream. Inspect the O-rings and seals before you put it back, since a pinched or dry ring can leak or let air in.
- Release pressure and shut down the pump
- Wear label-required gloves and eye protection
- Soft brush and clean water only
- Check seals and O-rings before reassembly
What are the signs of a clogged or damaged filter?
Watch for falling pressure, a pump that surges, uneven spray patterns, nozzles that spit and a pattern that looks fine at one end of the boom and weak at the other. A torn screen shows the opposite: debris reaching nozzles and plugging them quickly.
Sprayer output can look normal on the gauge when a filter is partly blocked, so also compare nozzle output against your calibration number. If a nozzle clogs again and again, look upstream instead of just cleaning the tip.
How do you prevent filter problems before they start?
Fill from a clean water source and use a screen on the hose end. Mix products in the order the label says, and fully dissolve or suspend them before adding more. Keep the tank lid closed, store hoses off the ground and cap fittings.
At season's end, flush the whole system with clean water and as the label or manual directs for cleanout. Pull filters out for the winter and store them clean.
When should you replace instead of clean?
Replace any screen that is torn, bent, stained through or stuck. Replace cracked housings and hardened seals. Keep a spare set on the shelf, since a plugged filter in the middle of a good spray window is a costly delay. For pump or regulator trouble that persists after filter service, call the dealer service department or a qualified mechanic.
Sources and further reading
- University of Nebraska-Lincoln Extension
- Purdue Extension
- Texas A&M AgriLife Extension
- National Ag Safety Database (NASD)
Organization homepages are linked so you can search them for current guidance on this topic.