How to remove chlorine from tap water
Chlorine in tap water is a common disinfectant, but residual chlorine may affect taste and health. The following are practical methods for dechlorinating tap water that have been hot topics on the Internet in the past 10 days. We provide you with structured solutions based on data analysis and user concerns.
1. Hazards and standards of chlorine residue in tap water
According to the national "Hygienic Standards for Drinking Water" (GB5749-2022), the residual chlorine content of tap water should be controlled within the following range:
| Project | Limit value (mg/L) | Description |
|---|---|---|
| Residual chlorine in factory water | ≥0.3 | Pipe network end ≥0.05 |
| free chlorine | ≤2 | Routine disinfection standards |
| Total chlorine | ≤3 | Chloramine disinfection situation |
2. Comparison of 5 mainstream dechlorination methods
| method | Time consuming | cost | Effect | Applicable scenarios |
|---|---|---|---|---|
| Leave to evaporate | 2-24 hours | 0 yuan | Remove 60%-90% | Daily drinking |
| boil | 5-15 minutes | low | Remove more than 95% | brew drinks |
| Activated carbon filtration | Instant | Middle to high | Remove 99% | Home water purification system |
| Vitamin C | 1-2 minutes | low | completely neutralized | Emergency treatment |
| Professional water purifier | Instant | high | Multiple purification | long term use |
3. Operation Guide (with specific parameters)
1. Scientific operation of static method:
| Container type | optimal amount of water | Evaporation efficiency | Recommended time |
|---|---|---|---|
| wide mouth glass bottle | ≤5L | 0.5mg/L/h | 6h in summer/12h in winter |
| plastic bucket | 10-20L | 0.3mg/L/h | Requires 24 hours |
2. Vitamin C neutralization method:For every 1 mg/L of residual chlorine, 0.9 mg of vitamin C needs to be added. Taking 500 ml of water as an example:
| Residual chlorine concentration | Vitamin C dosage | reference |
|---|---|---|
| 1mg/L | 0.45mg | 1/8 tablet (100mg tablet) |
| 2mg/L | 0.9mg | 1/4 piece |
4. Recent hot questions and answers
Q: Does the shelf life of water after dechlorination change?
A: It is recommended to drink standing dechlorinated water within 24 hours, and boiled water can be stored for 48 hours (needs to be sealed).
Q: What are the special requirements for dechlorination in fish farming?
A: Fish are more sensitive to chlorine. It is recommended to use:
1. Oxygen explosion method: aeration with air pump for 24 hours
2. Sodium thiosulfate: add 0.1g/10L water
5. User attention trends in 2023
| focus | Search volume increase | Popular areas |
|---|---|---|
| Water safety for infants and young children | +320% | Beijing, Shanghai, Guangzhou and Shenzhen |
| Instant hot water purifier | +180% | New first-tier cities |
| low cost solution | +150% | Third and fourth tier cities |
Summary:The choice of dechlorination method should be based on usage scenarios and cost considerations. The "standing + boiling" combination solution is recommended for daily drinking, and professional water purification equipment is recommended for special needs. Regularly test the water quality at home (residual chlorine tester can be used) to ensure the safety of drinking water.
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