Its now March 14, 2019. We have had the most severe winter in at least 60 years here in the foothills of the Pacific Northwest part of Washington state, in the U.S A. . We had 20 inches of snow here and freezing temps from December through the beginning of March. (Interestingly enough, as we talked with acquaintances in Alaska, we found that they had temps higher than, or nearly equal to, ours in many cases. Yes, climate is changing, its getting warmer there and colder here in the winter, and hotter everywhere in the summer.) The filters have been frozen for 3 months. Damage to the cistern will take months to repair. The filters are damaged but fixable because the pipes were not glued.
We will have another update when we get time to repair everything. The first filter, that we started back in 2007, is still functional and has had minimal damage. Its been running for nearly 12 years now; with the exception of freezzing weather times. Still produces clean, clear water. We will do another water quality test as time and finances permit.