Simple. Effective. Potent. 7 essential oils blended with menthol crystals combine like Captian Planet for an amazing shower experience for those with sinus or chest congestion. Please do not get these mixed up with bath bombs unless you want to have 'one heck of a come to Jesus meetin'. Simply place just out of direct line of water in the front of the shower and as it begins to effervesce, simply breathe. One use only, but makes for a good long hot shower.