its what we do....i have been told it saves resin having the vessels post tank.....something to do with slower flow saving the resin
but tbh...if i do 20 small jobs in a day, with a drive between each, i like to let the pressure out the vessels when packing up....so this wastes litres of water every time!!!
so using delivery only, stops all that, saving more water
so its a toss up between saving resin, or saving the water....i think saving the water ultimately saves more resin tbh