I worked in the HVAC industry in Miami for 40 yearts. 60% of the service calls involved a plugged drain. Alittle bleach is a good idea if you put it in the drain line. It won't harm your a/c as long as you don't put it in the drain pan inside the airhandling unit. I checked the link to the drain king. great idea but make sure you insert it enough so that the water doesn't run into your a/c unit.
Could be messy.
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