RO Water

The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
If you have answers, please help by responding to the unanswered posts.
Yes it is reverse osmosis water, which is basically filtered water. It's used to remove mostly everything from water (contaminants, stuff you don't want your fish to live in). It basically makes your water pure, which is good if your tap water sucks (has a very high or low pH, is very hard or too soft etc.)

To achieve it you either buy it, or you buy a RO water system. They're often paired with DI units as well. RO water is (I believe) 97% pure, while DI is 99.9%. RO/DI water is a mixed blessing. You start out with pure water, but then you have to add stuff back into the water to make it liveable for the fish. If not, since there is nothing to buffer the water, you'll have wild pH swings which will most likely kill your fish.

If your tap water is good enough for fish, use it.
 
Back
Top Bottom