Adding clean water

[slakker]

I use a Maxijet to pump water from the bucket into the sump...

[Norstar]

I use a small water pump to mix the salt, as well as to pump it in the tank. It doesn't have to be anything fancy or expensive as it is only use once a week

[TJSlayer]

Get a gravel vac !

I do something similar with my 75 gal...

I mix up two pails of water and when I ready I use a third pail and siphon off two pails of old water (shut my pumps off of course)

Then I stack the fresh water on top of one of the empty pails and siphon the fresh water back into sump and turn the return pump on. I do this with both pails.

The siphone has an auto start mechanism so by shaking it up and down it starts on it 's own.

Works well and takes about 10-15 minutes, siphon was about $12 at LFS.