we had the drain line back up after two years....our tech told us to pour a tea kettle of boiling water down that drain 2x's a year to clean out any crud that may have accumulated
in the line
I asked if I could use bleach (which I had used in my Ft Lauderdale home on this drain line) and he said to avoid using bleach as it can create problems with the A/C unit
the boiling water does the trick and I avoid having bleach go into the ground
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