Originally Posted by Momotaro
How can you make that assumption? For all we know, the tap water may be ideal for planted aquarium application. Simple testing will tell the story.Mike
The problem is we may never know.
It's an assumption based on the fact that you asked for water parameters and doodoobrown didn't give them or seem interested in testing for them. I used the word might
for that very reason, since my advice depended on what those parameters where, just as yours would have had we gotten them. You asked for the water parameters and doodoobrown never gave them. Based on this, I offered that it might be safer to just keep using his RO than to try using tap water that he hasn't or won't be willing to test as the foundation for his planted aquarium.
Also, once you've gotten used to producing RO and reconstituting it, it's difficult to go back to routine testing and dealing with fluctuations. The fact that he already has and uses a RO/DI unit also factors into my equation. I wouldn't advise someone willy-nilly to go out and buy/start a RO unit because I think RO is somehow always superior.
His tap water might be ideal for planted aquariums but simple testing hasn't been performed to determine that. I'm not saying everyone should use RO water because tap is evil. His tap might be so good that we'd all start buying our water from him for $1 gallon but we can't test for him to determine that.
I'm just trying to offer advice that will work and fit what the person is most likely to do. You can work with someone's tendencies or you can work against them. There's nothing wrong with him testing his tap or even using it if the parameters are stable and good. Lots of people with great tanks running in tap water. I'm just presenting information on the other method of watering his tank that he is familiar with and pointing out that it will need to be reconstituted for freshwater as well.
He'll get where he's going with either path, he just needs to take a look at what he wants to do and what he has to work with and decide which method he wants to try. It's not like I advise on commission.