Did you know that water can expire too? Yes, you heard that right, not in its natural state but can be diluted by the sealed plastic bottle which, can cause harm to our body. Here are some of the facts on how many days stored water can be used:

Water doesn't expire in its natural state but, when it is stored in something there may be chances that it can get contaminated because of the object in which it is stored. 

If we talk about plastic water bottles, it has a limited life and after it expires particles start to dissolve in water, which can be very harmful to our body to consume. 

Plastic has a limited life and it starts to dissolve in the item stored in it and can be very harmful to consume the particles and can directly affect our liver and kidney. The expiry date written on the sealed bottle of water is the life of the bottle only, it doesn't relate to water anyhow. So water doesn't expire but can get contaminated due to plastic particles. 

If we drink water from expired plastic bottles there may not be any harm. It may add some toxins, plastic particles and chemicals. But if we consume this water in large quantities it can cause severe effects on our body and may become the reason for ill health. Plastic bottles contain plastic BPA and other chemicals which can make the healthy water unhealthy. Plastic bottles have an average expiry of 2 years. 
Is tap water also bad for health ?

Simply the answer is no, but some things need to be noted before storing tap water. Tap water is normally stored in a Water tank, Earthen pot, steel utensils or water purifiers. According to the research, water stored in these things can be used for 6 months. Take care of some things before storing tap water which is, clean the utensil well before storing water, cover the water properly if stored in a drum, and glass utensils can be used to store water as well. 
Facts about RO water

If you don't use filtered water daily, make sure to change it every 3 months because the filter needs cleaning due to waste getting stored in it. And due to this, the particles get dissolved in the process of purification of water. 

Check purity of RO water by checking Total Dissolved Solids (TDS) from time to time. According to WHO, TDS should be less than 300 mg per litre. If the TDS varies from 300 to 600 mg per litre, the water is Fully healthy for us to drink.
Look at the reports given by different institutions 

National Environment Engineering Research Institute (NEERI), Central Pollution Control Board (CPCB) and IIT-Delhi have made reports and submitted them to NGT . According to this report, when RO purifies water it's mineral also gets removed from water fully. In foreign, bad effects of the RO system have been seen . People are facing deficiency of calcium and magnesium.  

PH of water 
PH of pure water is considered as 7. Normal PH of water is 6.5 to 8. Water with less than 7 PH is termed as hard water. Particles of iron ,copper and zinc are present in this water. 

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According to the reports it's dangerous for health to drink River water directly due to the pollution and dirt present near the coast of it. It also gets diluted with the waste coming from factories. 

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