In most cases, marine enthusiasts will prefer RO /
DI treated water, which you should sell to them in both freshwater and saltwater forms — more money for you and less hassle for them.
Not exact matches
At the top of my list for reef tank essentials is some type of
treated water, preferably RO or
DI.
So, since not all
water is created equal, many people use
water treated by reverse osmosis and deionization (RO /
DI).