Question:
RO: reverse osmosis water?

I know what reverse osmosis is, the benefits, and how you can achieve reverse osmosis water. I plan on using it in my fish tank but I am not completely sure how to get it. I am thinking that the machines in grocery stores where you can refill a gallon container for about 33 cents (at my local store anyways) is reverse osmosis but if it isn't how else can I get it for my 24 gallon tank?

Answer: If you have stores around you that sell the Culligan water (some have it for $0.33, mine is still $0.25), RO is one of the processes used in purification. I think some of the Target stores have it as well, as do some fish stores. If what you're seeing isn't Culligan, stop and take a look at the dispenser - it may have a brochure that tells what the process is that is used.

You can also buy a reverse osmosis unit you can use at home: http://www.thatpetplace.com/pet/cat/info... But these can get expensive, and they aren't terribly efficient - you use 8-9 gallons of water for every gallon produced, and you need to replace the RO membrane periodically. If you have a really large tank, or do a lot of water changes, they may be worth the cost, but that's something only you can decide.