GHL KH Director Reagent - 1000 mLGHL KH Director Reagent Keep your GHL KH Director running with reagent refills. It is important to maintain your reagent bottle to ensure that air does not get sucked up into the dosing lines during a test. We like to always keep a second bottle of reagent on hand and refill the original bottle that is connected to the 2. 1 SA Dosing Pump whenever the level in the bottle starts to get low.