question about water change

[segen77]

When doing a water change do you have to drain the water out of the tank or sump first then fill it back up with your premixed water, or could you have two identical pumps (one in the tank and one in the premix storage) and turn them on at the same time so water pumps out of the tank and back in all at once?

Hopefully this makes sense.

 

[CHizer]

Take the water out first so you aren't removing any of the new water.

 

[billdogg]

What he said. In addition, getting two "identical" pumps to work at exactly the same rate is pretty much impossible.

 

[Saltliquid]

Just take out roughly a quarter to a third of your tank water and add back the same each two weeks or check on what others do in water change of amount and frequency, i use to do a half of the tank per 3 to 4 weeks

 

[gone fishin]

I would remove old water first then add the new water.

 

[Hwobarg]

Even if both pumps had the same tubing lenthd and bends and height it would still need some fine tuning. However if you have a dedicates fish/sump room some folks have hard piped in some pretty engenious water change systems.

 

[downbeach]

+1 on removing old water first. This is also a good time to replace media in any reactor's using the old water to rinse the new media, i.e. GFO/GAC.

 

[ericarenee]

I Drain the water from the Return section of my sump . Its water level from the lowest operation level of the external pump is 40 gallons. So i drain it down to 10 gallon mark By turning a bypass valve on my return pump . Pumping sump water out to a Drain...
Then i turn another valve on my mixing station manifold to let water slowly gravity feed back into the Sump.... It gradually mixes with the Sump water / display...
I do not turn nothing off ... This is not always capable with a under the tank sump..Due to water quantity restrictions.

 

[Perth_reefer]

I swap out 10% a week, as others have said, old water out and then new water in.

 

[segen77]

Out with the old, in with the new. Got it.

I thought I was really on to something there. ha.