You can get away with using distilled water most of the time without worrying too much about copper or no3
contamination from most sources. Distilled water is usually used by people with smaller tanks ie <30 gal
due to the small water changes they have to perform. For anything larger then 30 gal
unit is the only way to go. ro
units only can still produce trace amounts of po4
which can lead to algae breakouts which is why you want to get an ro
unit which is usually only about $20-$40 more then a ro
I lot of people get them from ebay for around $100. Below are the 3 most popular sites:
(seems to be most popular on this site)
is a good place if you donâ€™t want to deal with ebay.
I would get a unit that comes with a storage container personally.