Yes, some not only goes through the filter, but very soon clogs it so that not much of anything goes through. I don't try filrering any more. I stir vigorously, let it settle, and stir again. After it settles, I decant most of the clear liquid as slowly as possible so as not to stir up the settlement. It's not the best way to prepare a really concentrated KOH solution, but I think it will be good enough for Rodinal. A gram molecular weight each of Ca(OH)2 and K2CO3 will produce 112 grams of KOH . I don't need more than 30 grams, which should be easilly gotten if I use enough water to make a 30% solution. It's theoretically more wasteful than filtering, but the ingredients are not very expensive and can probably be more easilly bought in some places.
Originally Posted by Photo Engineer