Sure would appreciate advice. Just had a high efficiency gas furnace installed. Furnace now generates about 1 to 2 gallons of condensation water every day or so. Have an alternate organic septic system that won't allow "soft water system" discharge or any high concentration of brine / salt water that will kill the bacteria in the septic holding tank. Furnace company installed drip discharge system leading to outside rain gutter but the condensation "dripping" into the gutter froze last week which caused a backup and shut the furnace down (wife not too happy). So, plan B would be to drill into house washing machine drain pipe (which leads to septic tank), attach furnace condensation white plastic pipe to washer drain pipe and have all condensation (heat now, AC in summer) drain to alternate septic system. QUESTION - would code allow this in the first place and also would it HARM bacteria in septic holding tank that turns everyting into safe graywater(which ultimately gets pumped to 12 sprinkler heads in back yard?