I have the aquamedic double doser and yes it to is not accurate I tried to have it dose small amounts throughout the day and not good. I found your better off and more accurate with a dose of 15ml or more at a time for me twice a day. You really have to keep it greased up to keep it working. I have my part A&B supplements in clear sealed measuring containers, so over time I can reference off each other to see if they are staying accurate. I also restart the system and measure the amounts every once and a while. I am fed up with it and just recently bought a calcium reactor. Hope it goes better for you.
If you are using it for 2 pat supplement you'll have to check the lines mine tended to bung up, I switched from the back flow valve to clear 1/4inch tubing hard (r/o type) worked much better.
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