Dosing pump Is NOT required. There is tweaking required in setting up the reactor. The water inlet can not be lower then the reactor itself or it will not prime itself. Also make sure you use a bit of silicone lub on the o-rings or it will leak in air at the top of the reactor which stops it after awhile. I have been using this reactor for about a year and for the money it's not a bad little unit.
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-=Bryan=-
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