Why water quality matters
Water can contain dissolved minerals that leave residue as it dries. Reducing those minerals can help limit spotting after a rinse on exterior glass and other suitable surfaces.
Reverse osmosis and deionisation
Reverse osmosis uses a membrane to reduce dissolved contaminants. Deionisation uses ion-exchange resin to remove remaining dissolved ions.
The finish depends on more than water
The original deposits, surface condition, cleaning action and rinsing all affect the result. Established mineral stains or stubborn contamination may need a different treatment.
For solar installations, the proposed method also needs to follow the relevant panel manufacturer’s guidance.
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