Purified Drinking water

IMO, it is a pain in the ass to drive to the store each time you need water. You have already spent a good amount of money on the tank, now why not invest in the most important part to a succesful reef tank. You can't go wrong with an RO for under $150 and there are cheaper units.

http://www.drsfostersmith.com/product/prod_display.cfm?c=3578+4395+10759&pcatid=10759

Also, I wouldn't trust anyone else's water if I didn't have a TDS meter to make sure their water is useable. You never know how often they change their filters, or if it is even RO water.
 
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