I realize that mixing partial batches of developer is risky because you can get very uneven dividing of minority ingredients. Does this issue apply to hypo-clearing agent? Reason I ask is that I don't think I have a 20L container handy (5gal pack), but 2 of 10L are readily available. Or should I mix it up at 2x concentration and then dilute more when using it? Will all the powder dissolve at 2x?