So, you let the juice sit to settle, then pour to another jar. If you let this new jar sit for a day or two in the fridge, will more particulates settle out? It could be that you haven't gotten the smallest ones that take the longest to settle, and then they are finally settling out once you mix up your drink.I can mix the ginger juice into the water and sugar mixture, but the juice will settle after a day. Is there no way to emulsify or stabilize the soda?
When I extract the ginger juice, I pass it through a fine-mesh strainer and discard the solids. I then let it sit for about an hour to allow the starch (white part) to settle. Finally, I pour that into another jar, leaving all the starch behind.