Originally Posted by
DJW
I'm not dogmatically opposed to the use of DI, but for freshwater it is not practical for me to use it.
The cost may be slight in your case, but for those of us that have an appreciable amount of CO2 in the water the DI resin is tapped out very quickly. With my water, I would be repacking resin every 200 gallons for a standard 10" can... it would cost a lot.
In the case of nitrate, my RO removes >90% of it, so if the source water is, say, 20 ppm the RO product water is about 2 ppm, not an amount to worry much about. A pothos plant would take care of that, a much easier and cheaper method than DI.
I wonder where something like C14H19N4+ would stand in the affinity sequence? Do you think a cation like that would be dumped back as the resin fills with more prevalent cations?