be aware : reverse-osmosis water removes calcium and magnesium, along with the chlorine (acidifying the water) be sure to pH !! .. that calcium and magnesium also needs to be replaced, your plant needs it ... you are probably better off, to just let your tap water 'air out' so the chlorine evaporates ... chlorine doesn't hurt your plants, but it can kill beneficial organisms in the soil (no big deal, for the most part) ... I wouldn't waste my time boiling it ... :smokin: