I did the coolant flush with Restore and Restore+ back in February of this year. I spent two days doing the flush. Driving for an hour with both the restore and restore+ and then who knows how many gallons of tap water I flushed through the system before flushing with distilled water and finally filling back up with ELC. I added a Sinister coolant bypass filter after the flushing process. I ran the first filter for eight months and this is what was still in the system even after the flush.