This is a bit difficult for me to measure because I buy the 5 pound containers of dye and I usually put 3-5 scoops, coffee measuring size, in a pot. The larger industrial size pots I use require more of course. Do not uncoil the seagrass. Cut of all but one of two of the ties holding it together and submerge it in the hot dye. I use one pound coils and weigh the coils down with pieces of lumber.
Some colors go faster and if the dye is really charged that helps too.
After several coils are done, I always add another scoop of dye to charge it back up. Some people think that adding a squirt of dish detergent to the dye bath lowers the surface tension and allows the seagrass to absorb the dye faster. Drying the seagrass is critical. I have clothes hangers bent, hanging all around my work room, old drying racks, and even old coat trees that I hang the stuff from. I think most people know not to wet the seagrass when using it and if it does get wet, it will bleed very badly.