Drain and refill question for AWC

[Aquavaj]

If one was to setup an AWC would it be better to stagger the drain/refill or do it simultaneously?

 

[hbrochs]

I take the old saltwater from one baffle away from the return pump, and the new saltwater goes in at the return pump. So old comes out at the end of the loop and new goes in at the beginning. I think this works to minimize the amount of nsw you’re removing.

 

[tupes]

Depends on where you drain and refill at. Personally it would better to stagger because when doing at the same time you can be sucking out new water

 

[Dhoggs]

I remove water from the 3rd chamber and refill water to the return pump section(4th chamber).

It also matters on how much water is being changed and the amount of time it takes to do the water change. My AWC is setup to change 1gal in a span of 24hrs (28ml every 10mins) so little chance that the new saltwater that was just added is being suctioned out during AWC.