We always state that IBC’s are agitated before they are drawn off and dilution. There are 2 alternatives; an air line ‘cable tied’ to a pole that can reach the bottom. Most of the time that works very well.
If however the product has been stored for a long time or maybe subject to warm conditions during shipment, it may have ‘dropped out’ more than usual (it is a suspension). Another alternative is to use a two handle ‘plaster mixer’ and to extend the shaft by cutting in two and welding both ends into a tube collar so that it can reach the bottom of the IBC. Within 10 minutes all should corrected and it should remain in suspension after that for another few weeks.
Once this has been done, for subsequent application a long wooden lath can be to agitate concentrate before drawing it off.