Its 5 in the morning and i wake up out of a dead sleep to find my air pump arking and smelling burnt as can be.had i not woke up out of a dead sleep i think i would have had a bad fire,it was almost melted when i unpluged it.cant explain why i woke up just something told me to,what are the odds i would have slept through this and not be here today....GFI is what im buying today ,this is a very good reason for all to take warning and get them.now the house smells like burnt metal and plastis but that is better than the alternitive....no house......