as an alternative to R/O water could I go for an HMA filter or a nitragon to remove nitrates? they have the added benefit of not producing waste water too. Does an HMA filter remove nitrates?
Thanks for all of the good advice
I'm actually located in stevenage - north hertfordshire, itself just north of london
We're all telling you not to use anything. Why would you want to spend money wastefully? Save it to buy some super nice Discus.