Yes, phototherm ssk uses 60ml per run and 105 ml per roll, so for 4 rolls ( 1 run), it uses 480ml. I use it One shot as i want the best consistency, but I could do replenishment if needed. But overall the cost of the dev is not bad. I think the flexicolor developer to make 5 gallons, is only $23 or so, which works out to about 12 cents (!) per roll for one shot developer cost.