I had standing water in the utility room in the basement of my townhouse in Baltimore around 1993. The A/C repairman told me to put a cap of bleach down the tube every month during A/C season. I've done that at every location since until about last September. This same topic came up here on this message board and several people, who I believe included D'Angelo, said it is better for the pipes to use vinegar. So I have switched to vinegar the last couple of times.
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