Water change temperature question

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LiveMermaid07

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Jul 7, 2009
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I had assumed that when I change the water for the pond, that since both it and the hose are outside that it would be the same temperature.

Is that actually true?

or true-ish?
 
If the pond is large enough and you're only doing a partial water change, a big change in temp isn't actually going to change the pond temp fast enough to be a problem. The larger the volume of water, the more water it will take to actually make the temp change significantly. If you're changing out more than 50% of the water and it's a smaller setup (less than say 500 gallons), then the temp difference might be an issue, but for instance my pond is about 1700-1800 gallons, and if I were to change out 50% of the water, the refill would take roughly 3 hours, and the small amount of water entering the pond at any one time is not enough to make a dramatic difference in the temp. If that makes any sense.
 
unless you're doing a really tiny water change, the hose temp doesn't matter -- after the first bit the water comes out at the temperature of the supply pipes, which are 5 - 10 feet underground and sort of at the average of the air temp for the past 6 months -- typically 40s - 50s
 
I don't adjust temp for water changes and i change 40-50%. Most of the time it's fairly close, so it's not a big issue.

With my cory tank I actually attempt to add in water that is several degrees colder than the tank to trigger them to spawn.
 
rainbowcharmer said:
If the pond is large enough and you're only doing a partial water change, a big change in temp isn't actually going to change the pond temp fast enough to be a problem. The larger the volume of water, the more water it will take to actually make the temp change significantly. If you're changing out more than 50% of the water and it's a smaller setup (less than say 500 gallons), then the temp difference might be an issue, but for instance my pond is about 1700-1800 gallons, and if I were to change out 50% of the water, the refill would take roughly 3 hours, and the small amount of water entering the pond at any one time is not enough to make a dramatic difference in the temp. If that makes any sense.
Click to expand...

That makes sense.
Mine is only 35g.
Since it was only the first water change of the season, I don't know the percentage, I just took out all but a few inches.

It does take maybe an hour or hour and a half to refill. (Which is a little annoying as taking it out doesn't take long at all, I just use 2 vacuum hoses, lol.)

They seem to like it when I refill though, constantly surfing the 'waves,' lol, so maybe they're ok with the temp (whatever it is)?


ps
I just planted 2 lilys, a mini cattail, and an iris something, I can't wait for them to sprout.
I HOPE they sprout! LOL
(all but the cattails were in there overwinter, but I raised them up in a basket so they're closer to the surface for now. I read even the bigger plants your suppose to start shallow and wait for them to get big before putting them lower?)
 
pbeemer said:
unless you're doing a really tiny water change, the hose temp doesn't matter -- after the first bit the water comes out at the temperature of the supply pipes, which are 5 - 10 feet underground and sort of at the average of the air temp for the past 6 months -- typically 40s - 50s
Click to expand...

urgh. The pond temp was nearly 70, that would be a big difference...
but our average temps here for last 6 months might be more like 40 -60s, so maybe it wasn't too bad??
oy.
 
35 gallons?? Are you sure you meant 35 gallons since you said an hour to an hour and a half to refill? My 40 gallon tank takes 10 mins to refill. Maybe 15 if I do a bigger w/c... I'm thinking you meant 350 gallons? That would make more sense.
 
Nope, 35 gallon pond tote. The garden hose is rather slow.

(and I wasn't actually timing it, but I'm sure it took at least close to around an hour to refill yesterday. I use the 'shower' setting so I don't blast the fish out of the water lol.)

The indoor tanks don't take that long, but I still have to do those by the gallon (argh!)
I was looking into a python like fixture, but right now it wont work with the faucet / water heater set up.
 
Wow, OK in that instance I'd say filling slow like you're doing should help with the temp change issue. In a small volume of water, a fast temp change is something that can happen MUCH more easily than in a larger volume of water, so the temp of incoming water becomes more important the smaller the volume of water.
 
Ok, I just don't want to shock/harm them, but they seem to enjoy it so maybe it's fine. (?)

I went out to see them today, I've got 2 little plant shoots yay!
 
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