batch water mixing???

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I keep premixed saltwater all the time. I have a 33g reef and always have about 3-5 gallons mixed on hand. I use the 5 gallon white buckets from the fish stores that have a small 3 inch cap to seal it in with.

I add the salt, shake the container a few times every day or so and then only airate it for an hour or two (plus heat) before adding to the tank. The bucket gets some brown residue on the bottom after about 15-20 gallons without rinsing but with the cap on, nitrates have never been a problem for me.

You can buys these buckets at the fish stores for $5. (Got mine at big al's)

That's what I would recommend.