Typically a reverse osmosis storage tank should have a precharge of approximately 7 psi. Depending on the make/model of your tank it may have a higher charge currently which would cause the tank to not fill. There should be a schrader valve on the bottom or side of the tank. Using a tire gauge and bicycle pump you should be able to check the current pressure in the tank and adjust it up or down to 7 psi.
reverse osmosis storage tanks: http://www.freshwatersystems.com/c-32-reverse-osmosis-storage-tanks.aspx
Geoff D., CWS-I - WQA Certified Water Specialist
Fresh Water Systems, Inc - http://www.freshwatersystems.com 1.877.335.3339
Dont forget to sanitize the tank and system as well there's a solution in the bladder of the pressure tanks , Sanitizing of the system should be done annually
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