If you want to clean your lungs out to the point of not breathing and even the sink “Black Swan Power Crystals” is your formula. Yet for me I think my lungs have been cleaned for a lifetime and I will use a mask the next time these crystals are needed. It is not as if I decided to take a bite but I guess one decided to send it’s toxicity into my system. I survived this experience (I think) and it did a great job for my kitchen sink. Black Swan Power Crystals an experience I’ll never forget and also great for your sink.