tap water thats been BRITA filterd . had no problems either ! 1st used normal tap water but that left limescale in the mantis tank . although the mantids were fine with just normal tap water . but now i BRITA it !
JOhnald, i think people are refering to settle the water in another container, let the chloride or any bad stuff (i am not a chemistry expert) go and pour the top portion of the water into the sprayer before using it.