I'm using FX-4 which is pretty close to Acufine with replenisher. Replenishing rate is 15 ml/roll, similar to the loss of fluid per roll. My replenisher contains twice the amount of developing agents and the simple amount of Na2SO3 like FX-4. My set-up is stable for 2-3 months once the same amount of replenisher has been added I discard it and mix new FX-4 and FX-4R. Once in a while I filter the FX-4 to remove particles.(posted 8398 days ago)With 70 rolls per liter replenisher it is one of the cheapest developers available.