Do you equalise water changes with the main tank's temperature ?

Do you equalise water changes with the main tank's temperature ?

  • Yes, using a heater

    Votes: 16 51.6%
  • No

    Votes: 15 48.4%

  • Total voters
    31
  • Poll closed .
Joined
28 Dec 2007
Posts
12,781
Reaction score
31
Location
JHB
I would like to know if who actually make sure there WC water is the same temp. as the tank ?
 
Last edited by a moderator:

Tobes

Retired Moderator
Joined
30 Nov 2007
Posts
9,482
Reaction score
119
Location
A Beautiful place!
I first heat the RO up to 25deg and then add my salt - dissolves easier when water is warmer. I then leave the heater and powerhead inside the drum until I do a water change. I match the temp and salinity(using a refractometer) as close as possible to make my fishies feel comfortable in their glass home :)
 

Rory

Admin
Joined
5 May 2007
Posts
4,857
Reaction score
37
Location
JHB
You should heat the water up any way to aid dissolution. I'd imagine it would also be better to oxygenate it at the temp it will be at in the tank
 

Al

Joined
23 May 2008
Posts
403
Reaction score
1
Location
Cape Town
Did my first water change on Saturday, Heated my water from Friday night and added salt after the water was about 20 -22deg.Left it for the night and did the water change on saturday.:thumbup:
</IMG>
 
Joined
28 Dec 2007
Posts
12,781
Reaction score
31
Location
JHB
The reason I asked this question is if you do the sums, the difference in temperatures has to be huge or the WC huge (%wise) to actually effect the tank.

I take Rory's point that warmer water may dissolve the salt quicker :thumbup1:


Temp. Sum:

50L @ 20°C is mixed with 450L @ 25°C, the 50L is 10% of the total volume (50 +450), so it's temperature effect will also be 10% iE: -0.5°C (10% of 5°C)

I know there maybe other factors involved with water temperature.

If I am calculating this right a normal type WC for me 5%, would need to be over 20°C difference, before I would have a significant temp. swing.

My 2c
 

Quinton

Smarty-pants Newbie
Joined
5 Feb 2008
Posts
451
Reaction score
7
Location
San Francisco Bay Area, California
I don't fuss as much for smaller changes (say 5-10%, although the solubility points above definitely do apply). But for larger changes (e.g. 50%) one needs to be very careful to match the temp, salinity and pH.
 

Rory

Admin
Joined
5 May 2007
Posts
4,857
Reaction score
37
Location
JHB
While it's true a smaller water change wont have much effect on the temp a .5 degree swing in a few seconds is probably pretty big to some sps... If I know the water is a very different temp I will add it bit by bit.
 

Alan

Admin
Joined
4 May 2007
Posts
5,974
Reaction score
124
Location
KZN
Depends on the size water change, for std water change of 150L then no i dont, as its only 5% of system. Larger water changes of 40 - 50% i would.
 
Joined
5 Jun 2008
Posts
82
Reaction score
0
Location
Mothercity
For smaller changes I have 2 drums of same size +-20l. First I make sure the level is correct (top up.) The next day I syphon from the tank into the one drum using air hose, at the same time I syphon new water from the other drum also using air hose. Takes about 30 minutes or so.
It is gradual and I can chill with the rugby and a :peroni: at the same time.:1:
 
Joined
5 Jan 2008
Posts
1,976
Reaction score
41
Location
JHB
I voted no but I do heat my water - to approximately same temp as tank - I find the water change as negligible effects on temp if it's not exactly the same temp.
 

Top