The most common methods of application consist of mixing the KW in RODI and allowing it to settle before adding to the tank either via ATO, Reactor, or drip. The reason you don't want the particulate in your tank is not because of impurities but because the particulate is undissolved KW. KW can only saturate water up to 2 teaspoons per gallon without the addition of a carbon source, because of this, anything over the saturation level of KW will stay in a solid form, if this solid KW is introduced to your system it could wreak havoc on your pH because it will begin saturating your tank water. You only want to ever dose saturated KW.

This is why when you see KW being dosed via ATO the pump is normally suspended towards the middle of the reservoir, to avoid pulling any particulate from the bottom of the ATO res. At this point, the ATO becomes one large kalk reactor. Although, I want to avoid this method as constantly adding new RODI would cause the slurry to stir up and would need to be allowed to settle down for several hours prior to turning the ATO back on. Reactors handle this by keeping enough KW on hand that the water on top stays saturated and free of particulate allowing it to be dosed into your tank.