prepping aquarium water

[turnerjo&blair <turner at chestertel_com>]

I was recently in a small town aquarium store. The owner was prepping water
using a 55 gal plastic drum that had been scrubbed and washed. Had a power
head circulating the water and had added whatever chemicals. Said he let it
circulate for 2-3 days, and then hooked hose to the power head to load the
water during water change. What does this activity accomplish other than
evaporating chlorine/maybe chloramines other than what could be accomplished
by adding a chlorine buster prior to addition of tap water during water
change? Also, if a planted tank, would not some of the other elements
valuable to a tap water change be evaporated out also? Thoughts? Blair


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