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Old 02-15-2012, 06:04 AM   #1
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Coffee Grounds

Need some advise here.

We started using ground coffee with a plunger type coffee pot. When emptying the grounds I dump them in the trash. My question is, will dumping coffee grounds down the drain to the gray tank cause a problem?

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Old 02-15-2012, 06:11 AM   #2
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Not sure but great question! Another way to rid of the grounds is use them to deter ants. Sprinkle the grounds in your lawn or around ant hills and they will disappear. Something about the acid in the grounds that makes them go away I heard.

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Old 02-15-2012, 06:37 AM   #3
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I would never put the grounds down the drain. There's just too much of a chance of causing a problem. The tank wants to build up anyway and that could make more solids. We have a septic system at home and live by the " Would I do that at home"
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Old 02-15-2012, 06:42 AM   #4
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Coffee grounds do NOT go down a drain. They can plug it up fast.

Here is a site that has 21 other uses for them that might be amusing thou:
21 Ways To Use Old Coffee Grounds - DIY Life
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Old 02-15-2012, 06:43 AM   #5
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If you're referring to the little bit left in your (sounds like a french press) coffee pot, or in my case, my washable filter, I don't think it's a problem. It's just like small food particles that I can't help but end up washing down the sink while doing dishes. I try to put as little as possible, both food particles and coffee grounds, down the sink, but nobody's perfect! To pour them all down . . . no, I'd never do that!
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Old 02-15-2012, 06:45 AM   #6
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I drinks lots of coffee and dispose of tons of coffee grounds. I would never dump any grounds down my drains into the gray tank. That would appear to be a major problem to me. I always dispose of them in the trash can, even at home. Never heard of using them to deter ants, but may give it a try.
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Old 02-15-2012, 06:45 AM   #7
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I also have used a French Press for coffee but I would be afraid the coffee grounds would bind the closing action on the shutoff valve as well as all the other issues.
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Old 02-15-2012, 07:07 AM   #8
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As an airline mechanic, I spent many hours unplugging water drain lines that were plugged by coffee grounds dumped down the drains from the galley, usually from a broken coffee bag. I stopped using my French Press because of the hassle of cleaning it up without letting grounds down the drain. I would usually put a paper towel over the drain to trap the grounds which worked pretty good.
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Old 02-15-2012, 07:12 AM   #9
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Coffee grounds are not water soluble. The grounds could damage the rubber seals on the drain valve.
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Old 02-15-2012, 07:26 AM   #10
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A little experience from a former S&B dwelling......We were told to use coffee grounds as a daily maintenance/cleaning method for the garbage disposal. This was a brand new house, btw. A few months later we had what amounted to a gigantic ant problem. Thankfully, they were non-biting sugar ants but still highly annoying and generally just nasty. After trying everything known to man; I called the builder and inquired as to what may be the cause. He came out and ended up disassembling many plumbing joints that spanned three levels of elevation. All p-traps and many of the joints had ant colonies expertly built with coffee grounds. He surmised that constant washing with drain water had leached the acid out of the grounds making them hospitable for the little critters. A thorough cleaning took care of it immediately and we ceased putting grounds through the disposal. No more ants. It certainly didn't help that our home site was deep in the woods and formally THEIR territory.

In any event; this is not a problem I would invite into my gray water tank.

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Old 02-15-2012, 07:33 AM   #11
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We put ours in the trash. Never thought about using them around ant establishments. I wonder if they would work on fire ants???? Gonna have to give it a try.
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Old 02-15-2012, 07:52 AM   #12
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Generally dumping coffee grounds in the plumbing does, in fact, cause problems, though I do not think they will cause problem with the gray tank itself.. The problem will be "Up-line" (As in they clog the drain, the one on the sink, not the tank's much larger outlet)
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Old 02-15-2012, 07:54 AM   #13
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I always play it safe when it comes to putting anything down my drains. I keep empty laundy soap containers to put any type of scrapes or waste in. Just my 2 cents worth of opinion...
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Old 02-15-2012, 10:15 AM   #14
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Interesting stuff so far but conflicts a little with what I heard/learned. I learned that dumping a mornings coffee grounds once in a while was good for the system as the grounds will attach to oils and grease and soap scum suspending it so it can be flushed. I do that like twice a year. But only with a half full or more tank. Then I also put it in all three drains.

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