Been getting for the season for the last couple of week. I did a Compleat ro wash in ' 22, put the membranes in solution and stored them in a freeze. safe place and brought them out to do a start up wash . I have a aquatec 8800 pump with 4 - 400 gpd membranes. one is new this year . trying to run a wash with needle valve open with the permate and consentrate sin the same bucket. ssap is not going from the first membrane into the 2 nd. membrane but sap is coming out of the permeate line no sap from t he concentrate line . When I turn the permate valve off the pressure doesn't go up. Any ideas would be greatly appreciated. I'm stumped, going to start boiling raw sap tomorrow till I get this figured out. Thanks in advance for any help you can give me.