$20-30 on a Triton test seems trivial compared to the cost of salt and losses. We had a bad batch of IO last year and it took forever to figure out why some tanks would suddenly not support LPS and others were fine because it was a longer term effect. Finally narrowed it down to the tanks with that particular salt. Switched to a different brand and everything perked back up. FWIW, we have been very pleased since switching to TMPro in the shop and service accounts. I hate salts with organics in them, personally, but I need to have one that can sit up to a week.