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Silicates


Alistar

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If you have RO/DI water that is reliably 0ppm, can it still have silicates in it?

 

 

I think if it is just RO it can, but if it is RO/DI with fresh filters, then theoretically no, if it is really reading 0ppm tds

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Well I have tested my TDS meter on multiple sources of 0 ppm water. So, I know the device is accurate. I am not having problems with any algae at the moment (cross fingers), but was wondering...

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I think if it is just RO it can, but if it is RO/DI with fresh filters, then theoretically no, if it is really reading 0ppm tds

Exactly. 0ppm TDS is exactly 0 ppm TDS. Silicates show up as TDS, so there are no silicates.

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Silicates are weakly ionized so may not register well on a hobbyist gradeTDS meter. The levels would probably be very low though it it is showing 0 or maybe 1 or 2.

 

Phosphates and nitrates fall into this same category and can be present in 0 TDS water, a more accurate test would be conductivity or resistivity which is more sensitive but also more expensive. For our uses TDS is usually sufficient. I use a HM Digital COM-100 handheld meter as it is more sensitive than the normal TDS meter and reads down to tenths of a ppm TDS which would equate to less than 0 TDS on a normal meter since they read in whole numbers.

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