Why do some elements concentration increase after RO unit?

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Sanjay Mohanty

If RO water has more of these metals than the raw water, then it most likely indicates these metals are leached from pipes or storage in contact with RO water. Water, just after RO, does not contain any ions, thus very corrosive and can dissolve metals from pipes or storage tank. To prevent this, RO water is usually post-treated or blended with other water that has more ions. So I would check how RO water is handled to find the source of these metals.

Waleed M. Sh. Alabdraba

thank you very much