1, children in the developmental period, children in the developmental period can not use alum foot soaking, because the children's skin is too tender, alum is a chemical substance, if the children with alum foot soaking will have a very bad effect.

2, fasting or overfed, we know that fasting or overfed people should not soak their feet, because soaking feet foot vasodilatation, blood volume increases, resulting in a decrease in gastrointestinal and visceral blood, affecting the gastrointestinal digestive function. So fasting or overfed people can not use alum foot.

3, is in a great anger, great sadness, great happiness or mental tension, physical fatigue, alum foot soak is good, but before soaking your feet to find out what people can not soak your feet, soak your feet precautions to do the right soak your feet, so that you can health care.

4, renal failure, heart failure and other critical patients, renal failure, heart failure and other critical patients can not use alum foot, due to the condition is very unstable, the foot reflex zone stimulation may cause a strong reaction to complicate the condition, so this kind of people are not suitable for alum foot.

The product is irregular crystalline block. Colorless or white. Transparent or translucent, glass-like luster. The surface is slightly smooth or uneven, with fine longitudinal ribs, and white powder. Hard and brittle, easy to smash. Slightly sweet and astringent flavor. To block large, colorless, transparent, no impurities is preferred.

Microscopic identification Transmission polarizing microscope: colorless and transparent. Negative protuberance; refractive index N=4564. homogeneous.

Alum is a tripartite crystal system. The crystal shape is fine rhombic or plate-like, usually dense block, fine grain, earthy, etc.. The color is colorless, white, often with yellowish and reddish colors. Streaks white. Glossy glassy, sometimes slightly pearly on the cleavage surface, lumpy with dull or slightly waxy luster. Transparent to translucent. Decomposition parallel (0001) incomplete. Fracture crystals are shell-like; massive ones are multilamellar, jagged, sometimes earthy. Hardness 3.5-4. specific gravity 2.6-2.8. brittle.

Mineral Chinese medicine. External use can detoxify and kill insects, dry dampness and relieve itching; internal use to stop bleeding, stop diarrhea, and resolve phlegm. Indications: stroke; epilepsy; laryngeal paralysis; scabies and wet sores; canker sores and swollen poisons; fire and water burns; mouth and tongue sores; rotting strings and wind eyes; pus in the ears; polyps in the nose; sores and hemorrhoids pain; leakage; epistaxis; bleeding from injuries; prolonged diarrhea and nine dysentery; itchy vagina; prolapse of anus; prolapse of the uterus, and so on. Alum is sour and astringent, cold and toxic. Therefore, it has antibacterial effect, astringent effect, etc., can be used as traditional Chinese medicine. Alum can also be used in the preparation of aluminum salt, baking powder, paint, tanning material, clarifying agent, mordant, papermaking, waterproofing agent.

Alum has sterilization, no side effects, if you have foot odor, may be a little uncomfortable at first, but nothing bad, do not put too much, every day before going to bed in the foot soak water to add alum 3-6 grams of alum, to be melted alum soak feet for 10-15 minutes every night, once a continuous foot soak for 5-6 days to alleviate the symptoms of sweaty feet. Also note that do not always wear a pair of shoes do not change, it is best to prepare two pairs of shoes to wear, as much as possible in the summer wear breathable sandals.

1, the best length of 15-20 minutes, foot soaking time should not be too long, to 15-2030 minutes is appropriate. Soak your feet when the blood will flow to the lower limbs, the brain is easy to insufficient blood supply. Cardiovascular disease patients, the elderly if you feel chest tightness, dizziness, should temporarily stop soaking feet, take a break. Diabetic patients with poor peripheral sensory ability, should be the first family members to test the temperature of the water to prevent burns.

2, the best water temperature in 40 ℃ -50 ℃, the water temperature can not be too high. Many people feel that as long as their tolerance, the water temperature is naturally higher the better, in fact, not. Soak your feet in the best water temperature below 50 ℃, the requirements of hot and not hot, feel the water temperature do not use your hands to measure, it is best to use your feet to feel. If the water temperature is too high, the feet of the blood vessels are prone to overexpansion, the body more blood flow to the lower limbs, but easy to cause the heart, brain, kidneys and other vital organs of the blood supply is insufficient, the body is not good.

3, the amount of water can not be too little, soak your feet is best to use a deeper, bottom area of the wooden bucket or enamel basin, can let the feet comfortably flat into, and it is best to let the water has been immersed in the calf.