The air handler part of our heat pump is in the attic. The PVC
piping, which carries the condensate when the heat pump is in air
conditioner mode, drains via gravity (no pump) to a spot outside, just
behind our deck.
After twenty years of use, a clog developed in the pipe and it
overflowed somewhere, with the overflow draining to the lowest point of
the pipe before it took a turn to lead outside, then dripping onto and
ruining a major swatch of our basement ceiling.
The heat pump guy came,blew the pipe out with air, confirmed it was
clear by pouring down a gallon or so of water, and we had the basement
A neighbor suggested pouring a quart of bleach down the PVC pipe each
year, just before the heat pump switches over from heating to cooling.
My question: is bleach best for this or can someone recommend
something else that would be even better?