Mid-30s overnight. Cloudy with light rain turning to light snow by 11:00 AM.
Into the woods by 11:00 AM to prepare the pH wash. But the yesterday’s wash cycle was still running. Only reached 110 in almost 20 hours. Not sure why. The spare membrane was from a different manufacturer that has different specifications.
We let the R/O cool for three hours before rinsing. Didn’t want to shock the sensors with cold water while the R/O was 110. Waited for it to cool to the 50s.
Swapped back the FilmTec membrane then prepared the pH wash. We got a digital pH meter to better dose the wash water. We want 11-12 pH with closer to 12 pH better. Settled at 11.6 pH. We hope the pH wash restores membrane performance. Better sap will help too.
Back and forth from the farmhouse to the woods several times rinsing, swapping and preparing the pH wash cycle. Done for the day by 4:00 PM.