Hi, my name is Mike and I have been in the plumbing and plumbing repair field for 20 years. I will be glad to help you today. If you turn the water off and disconnect the inlet pipe to the filter and direct the line to a bowl then turn the water back on do you have water there? If so then can you connect it again and disconnect the outlet pipe from the filter and see if you have water there? If you do not and you do have water on the inlet then the filter is ready for another change. If this does not solve the problem let me know and we can investigate some other causes.
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