Misting System
Care & Maintenance

A high-pressure system pushes filtered water through fine nozzles at roughly 1,000 psi, producing a mist so fine it flashes to vapor before it lands — cooling the air without leaving anything wet. The two things that keep it working beautifully are clean water and a well-oiled pump. Everything below is in service of those two ideas.

1The Pump

The pump is the heart of the system and the part that most rewards a little routine care.

Check & change the oil

• Check the oil level before each season and periodically through heavy summer use — most pumps have a sight glass; keep the level at the marked line.
• Oil should be clear to light amber. Milky or dark oil means it’s time to change it (milky usually means moisture has gotten in).
• Change the oil at the interval your pump manufacturer specifies — commonly after the first break-in period and then annually, using the exact non-detergent pump oil they call for. Don’t substitute motor oil.
• Dispose of used oil responsibly at a recycling center.

Listen and look

• The pump should run smoothly, not rattle or pound. New vibration or noise is worth a look before it becomes a repair.
• Check fittings and the high-pressure line for any weeping or drips — a fine spray at a fitting means a connection needs attention.

2Filters

Clean water is what keeps the tiny nozzle orifices from clogging, so the inline filters do a lot of quiet work.

• Inspect the pre-filter and any inline filters regularly during the season — monthly is a good rhythm in heavy use, more often if your water is hard.
• Replace filter cartridges on the manufacturer’s schedule, or sooner if you notice reduced mist quality or a pressure drop.
• Keep a spare cartridge on hand so a clog never means downtime on the hottest week of the year.

3Nozzles

The nozzles create the fog. Because their openings are so small, they’re the part most affected by mineral scale — and Arizona water is hard.

• Watch for a nozzle that drips, sprays a stream, or stops misting — usually a sign of a clog or a worn tip.
• Soak clogged nozzles in white vinegar or a manufacturer-approved descaling solution to dissolve mineral build-up, then rinse and reinstall. Never poke the orifice with wire — it permanently damages the nozzle.
• Replace nozzles that stay poor after cleaning; they’re inexpensive and a fresh tip restores a fine, even fog.
• Keep the anti-drip check valves (if your system has them) in good order so lines don’t weep between cycles.

4Bleeding & Pressure Checks

• Bleed air from the lines at start-up and after any nozzle or filter service — run the system briefly and let trapped air work out until the mist is steady and even.
• Check operating pressure against your pump’s normal range. A drop can mean a dirty filter or a leak; a spike can mean a clogged nozzle or a kinked line.
• A steady, correct pressure and a uniform fog across every nozzle is the sign of a healthy system.

5Spring Start-Up

Before the first hot stretch, take twenty minutes to wake the system up:

• Check pump oil level and condition; change it if it’s due.
• Install a fresh filter cartridge.
• Inspect nozzles and soak any that misted poorly last year.
• Turn the water on, run the pump, and bleed the lines until the fog is even.
• Walk the line and confirm every nozzle is misting — mark any that need replacing.

6Fall Winterizing

When misting season ends, protecting the system over winter prevents most problems the following year:

• Shut off the water supply to the system.
• Relieve pressure and drain the lines so no water sits in the pump or tubing where a rare hard freeze could reach it.
• Remove or cover nozzles per your manufacturer’s guidance to keep dust and insects out of the orifices.
• Store the pump per its manual — some call for fresh oil before storage, or a cover to keep it clean and dry.

7Water Quality

Because Phoenix-area water is mineral-rich, water quality is the single biggest factor in how often you’ll clean nozzles and filters.

• Hard water scales nozzles faster. If you fight clogs constantly, ask us about adding a dedicated pre-filter or a small softening/RO stage for the misting supply.
• Cleaner supply water means finer, more consistent fog and far less maintenance.

8Quick Troubleshooting

What you see	Likely cause	What to try
Nozzles drip instead of fogging	Low pressure, worn nozzles, or failed anti-drip valves	Check pump pressure and filter; soak or replace nozzles; inspect check valves
One or two nozzles not misting	Mineral clog	Remove and soak in vinegar/descaler, rinse, reinstall; replace if still poor
Weak fog across the whole line	Dirty filter or low pump pressure	Replace the filter cartridge; verify pump oil and pressure
Pump runs loud or vibrates	Low/old oil or a mounting/line issue	Check oil level and condition; if noise persists, call us
Milky oil in the sight glass	Moisture in the crankcase	Change the oil with the specified pump oil; recheck
Spray or drip at a fitting	Loose or worn high-pressure connection	Shut off, relieve pressure, and re-seat or replace the fitting

9Do’s & Don’ts

10Safety

• Always relieve system pressure before servicing anything on the high-pressure side — these systems run at very high pressure.
• Disconnect power to the pump before working on it.
• Keep the pump area clear and ventilated, and follow all electrical and plumbing guidance in your manufacturer’s manual.
• When in doubt, stop and call us — we’re glad to help.

This guide offers general, recommended maintenance information for Sonoran Landesign clients and is not a substitute for the instructions provided by the manufacturer of your misting pump, nozzles, and filters. Always follow their specifications and safety guidance.