I have a very old house with very old iron drains. In the past I've had two different plumbers in to clean out clogs, and each has recommended a different, exactly opposite, remedy. One snaked the drain, saying it was dangerous to blow out an old pipe; the other blew out the pipe with air, saying it was dangerous to snake an old pipe.
I need to have another drain cleaned, and would like to know which way is best and least likely to cause damage.
Thanks -