DI, distilled or treated water?

salty444

Member
I have access at work to DI treated water. Is this acceptable for topping off a fish tank? I just used the purple top distilled water from wal mart to do a 25 gal water change and was wondering what was the better of the 2. I'm really sick of the red slime constantly covering my tank on the inside.
 

salty444

Member
Just found out that the DI water here is copper free and made using reverse osmosis. Is this OK to use for tank top offs?
 
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