Systems, methods, and devices for preparation of water for various uses
including blood treatment are described. In embodiments, fluid is passed
either by pump or passively by gravity feed, through various filtration
elements from a fluid source to a treatment fluid container The latter
forms a batch that may be used during treatment. Methods and systems for
creating multiple-treatment batches are described. Advantages of creating
a multitreatment batch include the fact that the burden of treatment
preparation can be reduced and the timing of the preparation of the batch
can be independent of the treatment time. As described, there are various
trade-offs and concerns with this approach which are addressed by the
inventive embodiments.