A reduced pressure device comprising: a dressing configured to cover a dressing site and define an enclosed volume beneath the dressing and around the dressing site; and a reactor disposed with respect to the dressing so as to produce a reduced pressure beneath the dressing when activated, the reactor including a reducing agent and an electrolyte solution, wherein the electrolyte solution is configured to be selectively delivered to the reducing agent, and the reactor begins to react with at least one selected gas in the enclosed volume after the electrolyte solution is delivered to the reducing agent to consume the at least one selected gas within the enclosed volume, wherein the electrolyte solution is stored in a rupturable capsule positioned adjacent to the reducing agent, and the rupturable capsule is configured to rupture to deliver the electrolyte solution to the reducing agent; wherein the rupturable capsule is configured to rupture by way of pulling a tab (74; 174) operatively connected with the rupturable capsule; wherein the reduced pressure device includes a slit (70; 170) through which the tab (74; 174) extends to ambient, the tab (74; 174) being configured to be pulled through the slit; wherein the reduced pressure device further includes a cover layer (82; 182) having an adhesive disposed thereon, the cover layer (82; 182) being configured to be applied over the slit (70; 170) to cover the slit (70; 170) after removal of the tab (74; 174), wherein either (i) the reactor is disposed beneath the dressing, the dressing including the slit and the cover layer, and the tab extending from beneath the dressing to ambient, or (ii) the reduced pressure device further includes a chemical pump housing connected the dressing, the chemical pump housing including an inner chamber in which the reactor is disposed, the rupturable capsule being positioned in the inner chamber, the chemical pump housing including the slit and the cover layer, and the tab extending from beneath the inner chamber to ambient. a dressing configured to cover a dressing site and define an enclosed volume beneath the dressing and around the dressing site; and a reactor disposed with respect to the dressing so as to produce a reduced pressure beneath the dressing when activated, the reactor including a reducing agent and an electrolyte solution, wherein the electrolyte solution is configured to be selectively delivered to the reducing agent, and the reactor begins to react with at least one selected gas in the enclosed volume after the electrolyte solution is delivered to the reducing agent to consume the at least one selected gas within the enclosed volume, wherein the electrolyte solution is stored in a rupturable capsule positioned adjacent to the reducing agent, and the rupturable capsule is configured to rupture to deliver the electrolyte solution to the reducing agent; wherein the rupturable capsule is configured to rupture by way of pulling a tab (74; 174) operatively connected with the rupturable capsule; wherein the reduced pressure device includes a slit (70; 170) through which the tab (74; 174) extends to ambient, the tab (74; 174) being configured to be pulled through the slit; wherein the reduced pressure device further includes a cover layer (82; 182) having an adhesive disposed thereon, the cover layer (82; 182) being configured to be applied over the slit (70; 170) to cover the slit (70; 170) after removal of the tab (74; 174), wherein either (i) the reactor is disposed beneath the dressing, the dressing including the slit and the cover layer, and the tab extending from beneath the dressing to ambient, or (ii) the reduced pressure device further includes a chemical pump housing connected the dressing, the chemical pump housing including an inner chamber in which the reactor is disposed, the rupturable capsule being positioned in the inner chamber, the chemical pump housing including the slit and the cover layer, and the tab extending from beneath the inner chamber to ambient. (i) the reactor is disposed beneath the dressing, the dressing including the slit and the cover layer, and the tab extending from beneath the dressing to ambient, or (ii) the reduced pressure device further includes a chemical pump housing connected the dressing, the chemical pump housing including an inner chamber in which the reactor is disposed, the rupturable capsule being positioned in the inner chamber, the chemical pump housing including the slit and the cover layer, and the tab extending from beneath the inner chamber to ambient.