This is one reason why I hate submersible pumps and powerheads. I try to keep them to a minimal. My 120G has two Tunze 6000's (total of 30 watts) on a controller. 30 watts for 3700GPH is great! As much as some people hate Seio Pumps, they give a lot of water movement for the amount of energy they use.
When I mix water (usually 30 gallons at a time), I start of with both my Mag 9.5 and Mag 5 going. This allows a lot of water movement to help dissolve the salt (usually 12-24 hours). Unfortunately, I don't always get to changing the water immediately (sometimes it takes me a day or two - or even a week) - so I just leave the Mag 5 to keep the water circulating.
Minh
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