As above, would this take water out of tanks?

It would be easier to use a siphon

It would be easier to use a siphon

:lol: :lol: :lol: :lol: :lol:

funny Caryl :lol:

It will not cause the level of water in the tank to drop anymore than it does already. It only takes the moisture out of the air.

yes it will.

If you want a read about how it works check out

http://en.wikipedia.org/wiki/Le_Chatelier's_principle

Might help a bit

Agreed it will only take it out of the air, good for condensation on the windows and stopping mold growing etc.. Also good for when you overflow your tank and need to dry out the carpet so your lounge can be usable again :oops:

Agreed it will only take it out of the air, good for condensation on the windows and stopping mold growing etc.. Also good for when you overflow your tank and need to dry out the carpet so your lounge can be usable again :oops:

It will take it out of the air first, but the drier the air is the more water that will evaporate from the fish tank. Effectively your fish tank is a big air humidifier :lol:

Oh Please! Le Chatelier's principle only applies to a closed system in dynamic equalibrium. A dehumidifier in a room would have negligible effect on the relative humidity to a point where the vapour pressure would be significantly increased over a fishtank.

In other words the evaporation rate versus the rehydration rate would not be affected - the fishtank will evaporate at a given rate no matter what.

You should be doing water changes often enough that the drop in water level won't be particularly noticable anyway. Unless you've got a fan blowing across the top of an open tank it shouldn't be losing more than about half an inch a week or so.

I have one running next to my 4 ft tank which runs an open type sump.

I notice very little water loss in the tank with the dehumidifier running as appose/opposed to it not running.

And I also think thats it is true that yor maintainance schedule should counter any effect/affect anyway

HTH

Navarre

Oh Please! Le Chatelier's principle only applies to a closed system in dynamic equalibrium. A dehumidifier in a room would have negligible effect on the relative humidity to a point where the vapour pressure would be significantly increased over a fishtank.

In other words the evaporation rate versus the rehydration rate would not be affected - the fishtank will evaporate at a given rate no matter what.

Whoops, it's been a while since 7th form Chemistry.

:oops: :oops: :oops: :oops: :oops: :oops:

In other words the evaporation rate versus the rehydration rate would not be affected - the fishtank will evaporate at a given rate no matter what.

Le Chatelier's wont be what affects things

It's not the air pressure / closed system thats going to affect the evaporation rate, it's the relative humidity. If the R/H in your room was 100% then ZERO water could evaporate. The room would be pretty damp and mouldy, but no evaporation. If the room was 0% R/H water would evaporate relatively fast, depending on air flow and temp.

In a normal room the evaporation rate will be someplace between the to 2 extremes, but you can change the evaporation rate by changing the R/H.

So- YES a dehumidifier will make the water evaporate a little faster, and the fish tank will make the DH unit work a bit harder.

Best option, a tight fitting lit on the tank to reduce the evaporation.

Cheers

Ian

:lol: Errr... maybe we are missing the point a little here. At a practical level outside of the 7th form geekery, yes, you can use a dehumidifier without any adverse effects on your tank, and it will definitely improve your personal comfort and the health of your house. Go for it.

We found a HRV system worked the best. Had bad condensation before tanks, now none what so ever in winter

Thanks guys for all the help!

Mum wants to get one for winter but I was worried worried about waking up to dried up tanks, we all do weekly water changes so it should be sweet then

Yup.. in fact if you have fish tanks I would suggest getting a DH unit is a GOOD idea, just to keep the house dryer.

The DH may make the tank water evaporate a little faster especially if you dont have good lids, but not enough to cause a problem.

Cheers

Ian

I don't think it would affect your tank that much, we have a heat pump which dehumidifies the living area well in winter and I haven't noticed it doing a lot to my 4 ft tank in the lounge.