We bought these filters for our Berkey system. The filters are similar to the well-known branded filters that we have used before. It was obvious that the quality of the materials used to make the filters was inferior to what we were used to. We followed the instructions for filling and installing filters. Instructions recommend 8 turns for connecting filters between Berkeley chambers. We installed according to the instructions. The next day, the rod of one of the filters broke off the bottom filter, which screwed into the bottom filter. We immediately contacted the manufacturer to notify them and received no response. Fortunately, Revain accepted the return and we are refunding the actual Berkey brand filters. I like to save money but the quality is so bad that I can't recommend these filters.
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