A mister that produces a weak uneven spray in a hard water area has a mineral problem rather than a mechanical one.
How It Happens
Hard water contains dissolved calcium and magnesium. When water evaporates, those minerals are left behind as solid deposit.
A spray nozzle is where evaporation happens most: a tiny orifice, a thin film of water, and air moving past it between uses.
Deposits build in exactly the passage that has to stay clear for a fine mist, and it takes very little to change a fog into a jet.
The Symptoms
- A spray pattern that becomes narrow or one-sided
- Spitting instead of misting
- Reduced range and volume
- White crusty deposit visible around the nozzle
- White spots on leaves or surfaces after spraying
Where a range is sold for hair, plants and cleaning alike, of the kind catalogued at https://flairosol.us.com/, the water going in matters as much as the bottle for how long the mist stays fine.
Descaling It
White vinegar diluted with water, drawn into the bottle and sprayed through until the mechanism is full.
Left to stand for an hour or so, then sprayed through again and flushed thoroughly with clean water. Several rinses, because vinegar smell lingers.
Never use vinegar in a bottle that has held bleach, and never mix the two.
Preventing It
Distilled, filtered or collected rainwater, which contains no dissolved minerals.
That is worth doing for plant misting anyway, since hard water leaves white marks on leaves.
Emptying the bottle rather than leaving water standing also helps, since deposits form as standing water evaporates.
Do Not Poke the Nozzle
A pin enlarges or scores the orifice permanently, changing the spray pattern for good.
Soaking is slower and does not damage anything.
Find Your Water Hardness
Suppliers publish it by area, and it explains a great deal about a household.
Descale on a Schedule
Rather than when it stops working.
Store It Empty
In hard water areas especially.
Boiled Water Is Not Softened
Boiling removes some hardness and leaves the rest, so it is not a substitute for filtered or distilled water.
Descale the Bottle Too
Deposits form on the inside surface as well as in the nozzle, and they look like permanent cloudiness.
Rinse Vinegar Out Fully
Several clean-water flushes, or the next thing you spray smells of it.