In a hurry? Fill the bottom of the bottle (about 2 finger widths) with boiling water. Be careful not to touch the sides as the bottle will be quite hot. Drop the tablet in and let it dissolve (5-6 minutes). Top up the bottle with cool tap water, screw on the sprayer and get going!
Fill the bottle with warm tap water. Drop the tablet in and let it dissolve. It will be ready for use after 20 minutes but continue to breakdown. Screw on the sprayer and you're ready to go.