Re-invigorating "old" EIS is definitely possible. I prefer old, filtered EIS to pure distilled water - the whole is batch is pre-starter - provided the old EIS has not been treated with h2o2 before this reinvigoration.
As a working hypothesis now, I assume that EIS generation and potency follows third-order (or higher) pharmacokinetics with three time-constants on the order of magnitude of: (a)minutes, (b)days and (c)months. (A)The brief period of enhanced potency, the one Ode reports, probably has a time constant lasting several minutes. (B)The transient stabilization period probably has a time constant of several hours since it seems to run to completion after around a day. (C) The transient suspension period probably has a time constant of several months since EIS has a shelf-life made noticeable by plate-out and/or precipitation after a year or maybe less. Pharmacologists analyze these phenomena in terms of "compartment analysis." Has anybody seen or done a compartment analysis of EIS?
