Greetings! Firstly, apologies in advance to anyone who gets this from a number of lists, but I want to post it to a couple to get opinions from fish keepers in different areas of the hobby. Sorry for any confusion this causes. Basically, to cut to the chase, I'm giving up on my local tapwater. It may be soft, free of nitrates etc, but I have now had a number of problems (including a large wipeout in the last few weeks of catfish, apisto's etc) that have been linked to "pollutants" in the water. Even thought the water is treated with a dechlorinator ( API Stress Coat) and stood it doesn't appear to eleviate the problems. I was just wondering what methods people use to treat their water? I use about 100-120 Gals a week, split between breeder / fry tanks and large display tanks. I have a small R/O unit, and was thinking of upgrading to a larger one to use 100% RO, but it would need remineralising before use in many of my tanks ( Although I'm sure most of my apisto's wouldnt mind neat R/O :)). The advatage of R/O I suppose would be that if I move to a hardwater area in the future, I'm sorted. I have heard of people using carbon block filters, are these any good? This has the advantage of not having to be remineralsied etc before use...........? If people use 100% R/O water, what do they reccomend to remineralise it before use in "community" tanks, where I need a kH of about 4? Are there any other alternatives available ( I live in the UK)? Thanks in advance for any input or advice given, and a cheers to Pete Liptrot for his help thus far. Chris ------------------------------------------------------------------------- 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.