NOTHING LEFT BEHIND IN THE TANK: Tap water carries calcium and lime, and that residue collects on the heating element until steam output drops off. The minerals are already taken out of this water, so there is nothing to harden inside the machine. Start using it from day one on a steam mop and the tank stays clear from the first fill to the last.

POUR IT STRAIGHT IN: No measuring cup, no dilution, no mixing. Fill the tank from the bottle and start mopping. The formula is already at working strength, so the last bottle in the cupboard behaves exactly like the first and there is no ratio to remember between cleans or between rooms. That also makes it easy to hand the job to someone else.

LIGHT TROPICAL BLOOM SCENT: The tropical bloom comes through while you mop and thins out within an hour or so. It is a light fragrance rather than a heavy perfume, and it does not settle into rugs or upholstery. If anyone in the house is sensitive to scent, the same water is sold unscented in these same sizes, with nothing else changed.

SEALED FLOORS, TILE AND GROUT LINES: Use it on sealed hardwood, tile, stone, laminate and grout. There is no PVC in the formula and no film left to rinse off, so floors dry without the tacky feel some cleaners leave. Test a corner first on waxed or unsealed wood, since those finishes want a dry method rather than steam and a wet pad.

THE 32 FL OZ SIZE TO START WITH: Enough for several tank fills, which is the sensible way to try a scent before committing to a gallon. Fits any steam mop or floor steamer that takes plain water, no matter the brand, and the 128 fl oz jug is there once you know which one you actually want to keep in the cupboard the whole year round.