These Sponge inserts by Caputron are used as replacement sponges and come in different sizes. The 2"x2" and 3"x3" square sponge inserts fit into their respective size electrodes from Caputron. The 1.5" round sponge inserts fit both the Brain Premier and BrainDriver electrodes. Pack comes with 10 sponge inserts. It is important to properly maintain electrode sponge inserts in order to obtain consistent and uniform current distribution throughout the tDCS electrode, this minimizes the chance of current “hotspots” where current may tend to concentrate at certain areas of the electrode sponge surface due to the constant wear and subsequent degradation of the sponge material through usage—this results in inconsistencies in current density distributions. As a result, it is advised that you replace your electrode sponge inserts every 3-4 uses. These sponges come dry. As soon as one applies saline solution to them, they immediately absorb the solution and expand. They work best when inserted into the rubber electrode pad first as they expand quickly when wet. They provide excellent contact with and conductivity to the application area. Saline application - An application of ~7 ml of 0.9% saline to the 2x2 electrode sponge insert, ~15 ml of 0.9% saline to the 3x3 electrode sponge insert, or ~3 mL of 0.9% saline to the 1.5" electrode sponge insert is recommended for optimal stimulation configuration. Saline application should be performed after dry electrode sponge has been inserted into electrode holder.
