I've been using the standard 500ml tank with 250ml of solution with a motor base with no problems for six months now. However, I know have gotten my hands on the 2x 120 tank, and it asks for 1L. This only makes sense for hand processing. Would 500ml also be acceptable for this tank on a base? That seems to make sense, but I first want to know if you any of you have any recommendations or advice.