Water TDS levels in D1 block

[Krishna Rath]

Hello All,

I purchased a TDS meter from ebay and conducted some experiments by reading the water TDS levels . Please find below the readings of TDS (Total Dissolved Salt):

1. Water from normal use: TDS ranges from 400 to 550 ppm. 
2. Water from drinking tap:
          a. When normal tap also has supply: 400 to 500 ppm
          b. Between 1 pm to 3 pm (when normal water supply is off): 75 to 100 ppm
3. Water from Aquafina (Pepsi's mineral water) : ranges from 0 to 1 ppm.

From the above readings, it is clear that when the normal water supply is functional, it pollutes the drinking water supply and makes the drinking water worthless. Which is why, drinking water at evening tastes very poor (salty). In fact, at home, we have Aquagaurd and Pureit, and the filteration process could reduce the hardness from 450 ppm to about 200 ppm, just 50%. So any non-RO water filteration system is not useful when processing the drinking water at timings other than 1pm to 3pm.

I have not been able to find any authentic resource for any definite answers, however, http://www.tdsmeter.com/what-is is a good resource that tells what is hardness and how is the permissable range for drinking. 170 + ppm is considered as hard water and a TDS of upto 200 ppm is considered safe. However, that depends on what salts are dissolved.

So, what do we need to do? Ensure that we store the drinking water only from 1 pm to 3 pm, and for those who cannot store, would need to install an RO system that will remove the TDS from water.

Thanks,
Krishna Rath
D1-603