I take a look at when I changed my six stage RO/DI filters. 2017. Whoops. I changed the RO/DI when it was spent, I wasn't smart enough to change the filters. Glad I've only been reefkeeping since 91.
Ooopsie!
New filters in place, now back to zero.
Ooopsie!
New filters in place, now back to zero.