Until now, we used the company's "Developer DP-1000 for photosensitive substrate", but switched to this product from the cost aspect. As written in the item description, it can be used only by melting in lukewarm water, so there is no time and effort. If we use the empty container of DP-1000 that we used so far, we can make a developer without weighing. It's also good for stocking as it is bulky. ... It is a feeling that there is no disadvantage about the transition from DP - 1000.