stevedola
Master of my domain
Regular IO for many many years, thee is no real reason to pay more for a designer salt.
you pay more for reliability of batch testing and to not buffer the levels to appropriate measurements.
Ive had bad batches of IO where Alk was 13+ or calc was 330 or mag at 1150. Nothing like dosing all 3 levels and retesting. If i had a big enough tank to warrant the cheaper price tag and then buffer but since its only a 60g Ill stick with TMP