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The gallon is a game changer. Only 1 ounce is needed per large load. That's a lot of loads. It cleans the junk left behind from store bought detergents. So it cleans your machines while it washes your clothes. There is not that much of a smell, and I have very sensitive skin and doesn't irritate me at all.
The detergent works well, and glad to use it. The pump is TERRIBLE! Don't bother buying it w/ the pump. Just buy the normal jug of it. The pump drips after use and doesn't press evenly so the liquid squirts at different pressures and quantities, splashing everywhere; tried to adapt, but w/out success. We're ditching the pump and just pouring into the measuring cup now.
I'm on my 3rd gallon of this detergent. It's effective at cleaning clothing, has no fragrance, and is safe for my septic system. I have noticed that I have to add a little extra for smelly clothes or they dont smell clean when they come out of the dryer. Other than that I really like this soap and will use it for a long long time.
I have an old washer which may need to be replaced, but it's worked well for so long, I hate to give it up. Charlie's soap makes lots of claims of making your clothes cleaner but that's not been my experience. My whites don't come out brighter or even cleaner and I've asked them why. Usually they say it's because something's wrong with my washer. I use it mostly because it's cleaner for the environment.