Suggested water temperature:<br> Depends on different seasons, 35-37 degrees is good in summer while 38-40 degrees in winter. Spring and fall is in the middle.<br> Suggested time:<br> Evening is pleasant time for bathing, it is suggested to take 15-20 minutes, please take short break in case any uncomfortable<br> Not recommended for:<br> The one who has heart diseases, high blood pressure, haemophile, allergic to plastic, low perception, cancer, pregnant and in menstruation period. Someone who has special problem may consult doctor before using our product.<br> Symptoms:<br> Be aware of some symptoms caused while taking bath, such as dizziness, vomit and chest tightness, please low the water temperature or level in case it happens, or take a short break and retry. Please stop when it become serious.