Even the 3 part system that is talked about on reefkeeping now advocates the use of NACL free salt, interesting the recent change. However the NACL free you can get will not have all the trace elements found in your sea salt mix.
This is not about adding extra elements as pointed out above its about making a balance and to do that you have to replicate everything that is in your sea salt mix minus the sodium chloride.
why minus the sodium chloride?...... because you bi product of your 2 part dosing is sodium chloride. its already there free swimming looking for the NACL to bind to, the added benefit of the Tropic marin system is that the NACL also comes with the same amount of trace elements in your salt mix and in doing so constantly re vitalizes your tank with them.
The whole point of the system is about balance, not about trace elements that are added as an '"addition" to your system.
Your are re balancing the basics, not the complexes.
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