I cleaned my brute with vinegar to get rid of existing precipitate and then power washed the brute. Filled with 15 gallons of fresh ro/di that measured at 0 TDS. Added IORC salt to water (was at 71F at time of mixing) with two power heads running and no heater. Measured 2 hours later Temp: 71F 1.025 (Milwaukee) Alk: 9.4 dKh (Hanna) Ca: 470 (Salifert) Mg: 1350 (Salifert) These numbers are a little weird for IORC, but that's always been a problem with mixing partial bags. So we'll just roll with these numbers. I then placed heater in and turned on after testing the initial water params. The two power heads continued to run the entire time. 24 hour result Temp: 78.6F 1.025 (Milwaukee) Alk: 9.4 dKh (Hanna) Ca: 450 (Salifert) Mg: 1350 (Salifert) So far, params haven't drifted at all (Ca is well within margin of error). Will update in a few days.