Hi there brian
It depends on your tank
on th size that is.
If you have a small tank then buy your water ,or lots of people are buying there RO/ , or RO/DI unit and adding it to there topp off for the sump or tunze topp off system.
It's going to be all up to you
what is your budget!!!!!!!!!!!!!!!!!!!!!!!1
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180 starfire front, LPS, millipora
Doesn't matter how much you have been reading until you take the plunge.
You don't know as much as you think.
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