Switching which body area goes to which side of the tray is called polarity switching, and there are some misconceptions about it, so let’s discuss it so you can do it correctly IF you even do it at all. Polarity switching (for example, putting your right hand in the tray with the red electrode or the positive side and your left hand in the black or negative side, and then switching them after a given time period) has some possible upsides as well as downsides. It is proven that the positive/red electrode is slightly more powerful than the negative/black electrode, so theoretically, if one hand/foot always stayed in the positive side, it would get results first. The hand/foot in the negative side would eventually catch up after several treatments. However, if you are treating at a high dosage, which is much more likely when you are treating with a Variable Pulsed Current that the DVP1000 offers, the hand/foot in the negative side is getting treated at a level that does not make it lag behind the positive side, so there is typically not a need to practice polarity switching in this case. Because of the higher/faster efficacy in the positive side, many physicians were taught many years ago to recommend polarity switching and some manufacturers have built into their device a feature to switch polarity after x number of minutes into a treatment session. For reasons discussed below, Hidrex products do not have polarity switching features and do not recommend switching within a given treatment session. On the downside, many users that have done polarity switching halfway through a treatment session report an intense and very uncomfortable feeling immediately after the switch due to the quick reversal of the electrical current. For that reason, we recommend if you DO practice polarity switching, it is better to switch every treatment rather than in the middle of treatment (for example, treat right hand on red and left hand on black on Monday, and then right hand on black and left hand on red on Tuesday. That way, you avoid the negative affect of this treatment. This is the primary reason Hidrex does NOT make Polarity Switching as a feature of the device. Whether you practice polarity switching is a personal choice. On one hand, it may possibly have the hands reach dryness more equally. On the other hand, it is a bit tedious to remember or log which side to do every treatment, and it may not even be necessary. On occasion, we do have customers that we advise to practice polarity switching, so it can be necessary in some cases. The bottom line is, if you do decide to switch polarity, we recommend switching every treatment not halfway through treatment, to get the possible benefit of it without the possible discomfort.