We have some articles on RO
filters in our aritcles area and I beilve our sponsor AquaFX has posted some links to some aritcles they have on their website about how RO
filters work, etc.
As Biggen said you can have a sucessful tank with out a RO
filter but alot of that success is dependant upon your local water quality. Using the PH
of the water as a scale of water quality would be like telling someone a resturant has good food becase of the smell from outside.
There is much in the water that a simple PH
test can not turn up. Things like trace ammonia, nitrate, copper, lead and other heavy metals. The RO
membrane will in essence remove 99.9% of the impurities from the water and what you end up with is nearly pure H20. Everythign your saltwater tank needs is contained within the salt mix. There is no need to add these elements back to the water when doing water topoffs because its the h2o that evaporates and not the elements.
If you do want to look at some RO
filters I belive our sponsor AquaFX has some good deals currently going on.