Hello im thinking of buying 2 dosers and a kh director from ghl tried writing GHL at Sales@ghl but no answer

Now i have a Red sea max E 260 and using it stock, whit the build in sump behind.

in the cabinet i have a chiller and dosing containers and dosers. i have no sump under the aquarium.

ill therefore have to suck the water down from the sump and to the KH Director under the aquarium. i also have my liquids there and will pump them up from the cabinet. ( i do that now its working fine)

how ever im unsure about the KH director if it can handle the water to be sucked down ( also will gravity "syphon start" ? )

it says in the manual that it empty the water to hose to make a fresh sample for next dose will it also work ?

im just waiting for some clarifications. before i decide to buy.