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 ceiling repaired.
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?
Many thanks, bob