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Old 04-19-2003, 02:14 PM   #1
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dehumidifier water experiment

6-8 months ago I asked here if dehumidifier water was safe to use in tanks. The consensus was that the coils are made of copper, and the solder used to connect the coils has alot of lead, so it was not recommended.

Being the stubborn person that I am, I decided to try it anyway .

My "study" was decidedly unscientific. I used the deh water to top off my 45 gallon tank 2-3 times a week. I also used deh water in my 50 gallon barrel that i over winter a tropical lily in.

Water changes in the 45 are infrequent, maybe 50% once a month. tank inhabitants are 4 comets, 2 Siamese algae eaters, and 1 bazillion snails. 8-10 varieties of plants, some copper sensitive. Results: fish grew, no diseases, I would say they thrived. plants grew, sporadic algae attacks, pretty minor. All in all, no ill effects from deh water.

The barrel has never had a water change since october, just topped off 2-3 times a week, mostly with deh water. no fish there, just a lot of snails, which thrive, 3-4 kinds of plants all doing well. no filtration at all in the barrel.

My conclusion is that at least in my case, dehumidifier water is safe for use in planted tanks. The fact that no plants that are copper sensitive died or became unhealthy says to me that the deh water contains no copper.

Disclaimer to this post!!! If you choose to try this, you do so at your own risk! I have no tests for heavy metals in water so I have only observations to go by, ZERO hard facts.
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Old 04-20-2003, 04:21 AM   #2
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you could get it tested if you really wanted to
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Old 04-20-2003, 06:05 AM   #3
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I don't think copper leaches into water as readily as some would like to believe. Many of us have copper water lines and use that water straight out of the tap with no problems. I have, in a pinch, used some tap water from here in my SW tanks as top off water with no ill effects and I have copper lines. I suspect your dehum water is just fine. Most of the units have aluminum coils with no solder...if yours is copper, it's one of the better quality ones. I also think the solder used on it will have a lot more silver than lead.
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Old 04-20-2003, 12:30 PM   #4
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you could get it tested if you really wanted to
Too lazy. hehehehehehehehe. This all evolved due to my laziness. My job to empty the dang thing, my job to top off the tanks. coul'dnt see all that perfectly good water going down the drain.

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I suspect your dehum water is just fine. Most of the units have aluminum coils with no solder...if yours is copper, it's one of the better quality ones. I also think the solder used on it will have a lot more silver than lead.
I did not know that, good to know. I'll look eventually, see what the coils are made of, I just assumed copper.
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