The problem with any "perfectly balanced, proper levels salt" is that as soon as you add it to your tank, it changes. If you have a healthy tank with corals that are growing at a constant rate, without supplementation, you'll have noticeably less everything in 24 hours. So, you have to supplement the tank regardless, whether that's with 2 part mixes, kalk reactors, Ca reactors, etc, you must replace what the corals consume. Water changes alone will not suffice in a fully stocked reef.
So if I have to monitor and maintain levels in the tank, I'm not so concerned with the levels of the 10 or 15 % new water I add, it will adjust with my maintenance routine.
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Brad
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