I bought these to replace the filters on my 2005 Culligan AC-30 reverse osmosis system. As received, three elements (particulate filter, activated carbon filter and reverse osmosis element) were too short for the canisters of the AC-30 filter housing and therefore unusable, which I only discovered after a complete pre-rinse. this is required in the AC-30 service manual. Also, during my pre-rinse of the elements, I noticed that the particulate filter bottom cover was not fully bonded, so there was a significant amount of leakage around the bottom cover and therefore not going through the particulate filter. All three are very poorly made compared to the Culligan brand filter set. I strongly recommend that you don't spend any money on it (like I did).
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