OK, well that makes me feel a bit better. The de-nitrator I am using is made by a German Company called Aqua Medic, it contains Deniballs which are biodegradable plastic. It sits under the tank and water is pumped into the reaction chamber, and then pumped back into the tank at about 0.5 pint per hour. I am not familiar with the ones you mention as I presume these are US manufacture. I am in the UK and I have not heard of these makes before. I have not used RO
water yet as I wanted to get the tank habitable before trying something new.
Learning something new every minute, so apologises if any of my questions sound stupid. When would be a good time to introduce livestock?.