Do Water Changes Help Oxygenate?

[Bex]

Does a water change put more O2 in the water? Or do you take some O2 out if you use hot water to make it tank temp?

I know some people put hot water into the replacement water and some don't? What's best?

 

[SamUK]

andywg is the one to ask but i THINK hot water holds less o2 than coldwater but either will hold more than your tanks water cos thats been used by the fish.

so yea water changes do help.


also people dont add warm water jus cos its easier to run a hose in to a tank than fill buckets to temp.

ivve only jus started doing that tho cos i thought the temp would drop too much. it doesnt tho

 

[Jules H-T]

Temperature is not the only concern. If the water is coming straight out of the tap, I would imagine that it'd have less oxygen- purely because it wasn't been exposed to any.

 

[andywg]

The oxygen in a tank will be used up by the fish, but the CO2 will gas off and oxygen will re-enter at the surface.

Assuming that the temperature of the water coming in and that of the tank is the same I suppose there might be a slight increase in the amount of dissolved gas, though this would be an extremely temporary effect (think of it lasting for seconds to a minute at most).

Colder water in would increase the amount of dissolved oxygen, but the level would return to normal once the water heats up.

So to answer, the change may cause a temporary fluctuation in O2 levels, but nothing major.

As to best view on heating or not. I think you will find most people who have a large number of larger tanks say no to heating as it is not necessary on most water changes (some members change large amounts and so have to).

 

[avirex]

why not get a bubbler... there not expensive..?

 

[andywg]

why not get a bubbler... there not expensive..?

Because they have very little impact on the dissolved oxygen level

The bubbles are not in the water long enough to allow any gas exchange, and they have very little effect on the surface agitation when compared to other methods, such as a well aimed filter/pump outlet.

 

[max11180]

Jules H-T, i think the oxygen level in your tap water will depend on where you live. If you live in a large city, then chances are it will be flat, and hard water, due the constant recycling, and processing. If you live somewhere a little more country, with natural resovoirs, then the water is generally lively with oxygen, and soft, however, if its too country then it generally has a high nitrate, and phosphate count, due to farming activities.

 

[SamUK]

The oxygen in a tank will be used up by the fish, but the CO2 will gas off and oxygen will re-enter at the surface.

Assuming that the temperature of the water coming in and that of the tank is the same I suppose there might be a slight increase in the amount of dissolved gas, though this would be an extremely temporary effect (think of it lasting for seconds to a minute at most).

Colder water in would increase the amount of dissolved oxygen, but the level would return to normal once the water heats up.

So to answer, the change may cause a temporary fluctuation in O2 levels, but nothing major.

As to best view on heating or not. I think you will find most people who have a large number of larger tanks say no to heating as it is not necessary on most water changes (some members change large amounts and so have to).

see i told you andy would be the one to ask lol.