re: A/C drip pan full. Bleach down PVC drain pipe?

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where is the drain line outside?

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You may not have one. Some AC drain lines hook into your regular plumbing and drain into the sewer. Mine connects to the drain from a shower in the next room.

As a result, we have to cover the drain to that shower when we blast out the AC line with compressed air. If there is gunk in there, it can hit the ceiling in the shower.

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With all due respect, you don't really know what you are talking about. "Calling a professional" is completely unnecessary, AC drains get clogged with algae, dirt, etc. routinely and need to be cleaned with something like bleach. As said, an Ac tech will tell you to put a capful of bleach in there about 3-4 times a year. The Ac tech will come out and do the exact same procedure, it's not a symptom of something else it's the symptom of exactly that.

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How do you pour bleach down it? My AC drain line comes straight from the blower/motor box. There is no clean out valve.

Husband did that once with the bleach. Never again, thought we were gonna die from the fumes. The tablets worked great.

Home Depot looked at me like I was an alien when I asked for one.

(no message)

Is the A/C drip pan the secondary drain? Meaning, for it to fill up, the primary drain (usually drains to a nearby sink) is clogged...

Pouring bleach down the line will etch and eat the PVC. Once it is etched it gives the algae something to grip to and the problem will just get worse and worse making it easier for the algae to take hold.

Still can't find one of those damn guns anywhere in town.

If you're going to blow it out, do so from the pan outward. I use a shop vac with the cone shaped attachment like someone said earlier and suck it out from the outside. Works like a charm.

I am so getting one of these drain guns. It's one of things that will actually make me look forward to the drain getting stopped up....ok, may not.