f73a157e_ion_and_Trouble_Shooting_Guide__PROBLEM
[CAUSE] - Normal R.O. process. - Low water pressure. - Filters plugged. - Fouled membrane. - Low Tank air pressure [SOLUTION] - Your RO system makes water a drop at a time. 4 gallon storage tank should be full within 6 hours. - Increase incoming water pressure. This may require a pump. Check for kinked tubes. - Replace water filters. - Replace RO membrane. - Check tank pressure with specially calibrated air pressure gauge. Fill to 7 PSI. [PROBLEM] 
Makes water slow.
Water Filter and Reverse Osmosis Installation and Trouble Shooting Guide
PROBLEM