tDCS electrode sponges can be replaced every two weeks or after seven tDCS sessions. However, for optimum performance and hygiene reasons, we recommend replacing your sponges after each session. Replacement sponges for 2×2 and 3×3″ electrodes can be purchased in packs of 10 in our online store. In addition, due to customer requests we now offer replacement sponges in subscription plans at discounted pricing.
Over time, the sponges within sponge electrodes can grow brittle and crumble, crack, or split, causing an uneven distribution of current. Worn-out sponges can cause an uncomfortable tDCS session, with increased tingling, itching, and sometimes stinging sensations occurring. A good way to tell if your sponges need replacing is if soaking them with saline solution becomes more difficult, if they start to display a darker/brownish color, or begin feeling “stale.”
More importantly, if your tDCS sessions become uncomfortable, or you start to notice sensations that maybe you didn’t before, this is a good sign that your sponges need replacing. You can find 10-packs of replacement sponge inserts for both the 3×3″ Amrex Electrodes and the 2×2″ Amrex Electrodes in our online store.