Nu Calgon-4165-24 Drain Solve

Clears the clog in instant and AC is now working in good condition.

Always been using this for AC drain line only. Works well.

Fantastic product! I sucked the water with vacuum, I poured it in the pipe, 1/3 bottle then I added about 1/2 gallon of hot water. The next day, I poured another 1/3 bottle. I let sit in the pipe ( air handler off) for couple of days. On the fourth day I added a gallon of hot water and sucked the pipe with the vacuum, the water was dark murky and calcium flakes were at bottom of vacuum.

My AC unit, like many others, has a tendency to back up when used heavily, especially in the summer months. I've used bleach and vinegar with some amount of success, but someone mentioned this stuff works very well. All I can say is, so far so good. I've used it for about 4 months now and had zero issues. I even vacuumed the line to check performance, and there's none of that white slime or excess water buildup. I've only placed it in the line and not directly into the pan. That's next to try to ensure a summer free of AC stoppage.

I haven't had a problem with my HVAC system clogging since I started using it. My only complaint is that it's so expensive.

My AC man recommended this product to keep my AC condensation line clear. So far no clogs and seem to work well. Two points though, follow the instructions thoroughly and if it gets on your skin walk off right away. This is strong stuff!

Great product. My A/C repair person recommended this for my A/C to clean up gunk in system. I use it monthly. It works.

It definately works .. well! The first pic is the first time i did the full flush. The second pic is the second time I did a full flush. I figure i need to keep doing it until nothing comes out anymore.