smmetz
Fishaholic
whats R/O water anways???
I believe he is referring to water filtered through "reverse osmossis". I probably spelled it wrong. But anyway, it's a type of filter that takes out minerals and stuff from the water.
whats R/O water anways???
that's exactly the same question you asked 2 posts down on how to lower your pH - it's the same thing.
. You have to collect after its been raining for a bit to get water with fewer airborn contamination. Just get a water butt with a downpipe diverter of an existing gutter system and stick a stocking filter over the inlet into the butt so as to catch any debree from the roof. Cover your butt so insects don't get in and wash silt out a few times a year. The ph of the rain water here is around 6, so you can mix with tap water as ro do. Most tetra breeders use this method of bringing ph down. And you'll be doing your bit to save water 
If you want to understand a bit more about water chemistry in the tank, this is a very good article.
