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I have 3 stage water purifier installed at my home which first filters the water, performs reverse osmosis and then treats it with UV-C rays. The water that is released at stage 2 (RO) is usually drained-off. Can this water be used for gardening purposes? Or, better still, can it be collected and somehow passed through the purifier to make it potable?

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  • What is the source of the water? (I postulate it should be OK, however it will have a slightly higher percentage of "contaminants" (it would likely have 1/20'th to 1/5th more contaminants per litre then if the to filter was not present). I expect this would be unlikely to be an issue.
    – davidgo
    Jan 11, 2021 at 9:17
  • the source of the water is the government managed municipality water supply system; although I have to admit, the water quality index may be way different in most Asian countries than in European/American countries. I currently do not know/have means to measure the quality.
    – anurag
    Jan 11, 2021 at 9:33
  • I suggest reading what the RO process does.
    – blacksmith37
    Jan 11, 2021 at 19:08

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I collect water in a bucket using extension feeder pipe as shown in figure. enter image description here

I reuse the water released from system for daily household cleaning purpose. I checked the TDS value at all stages and it is as following:

Source (Tap Water from government): 800-850 ppm Filtered water (RO+UV): 120-130 ppm Released water (stored in bucket): 1000-1100 ppm

Released water is good for flower plants but not for vegetable plants. But there is also need to check mineral content of released water to confirm gardening uses.

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