[framerguy]

RODI= Reverse Osmosis/ DeIonized water. It's a device in the $150-200 range that will produce the pristine water that is a must for reef aquariums. You CAN use tap water but it really MUST be primed as stated above. Get a large Brute trashcan (or similar container)and fill it with tap water. Put a circulation pump in there to agitate and mix the water. An airstone is not necessary, it will put to much CO2 in the mix. Put a heater in there and set it to match your tank water. Add salt mix in the appropriate amount. Cover the can but leave some ventilation (the electrical wires between the lid and can should be enough) and let it simmer for one week. Then the water can be used without as many quality issues. It won't be perfect but will work til you get your unit. Once you give in and get an RODI unit you will be taking your reefing hobby to the next level. Water quality can't be over emphasized.