I am thinking of buying a RO. After having been around a few places, I was told by one seller that Ion-Exchange Resins also work to soften the water and is a lot cheaper. I wonder what is the difference the two and, in my case, would just an Ion-Exchage Resin good enough for my apistos? I have been using Tetra KH/pH Minus alone with my local tap water. I'd like to move on to the next step! Arthit Bangkok, Thailand. -- _______________________________________________ Get free e-mail @thailand.com and more. Visit thailand.com for everything you need to know about Thailand. http://www.thailand.com. "Comprehensive Thai Insights for the World." Powered by Outblaze ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com.