No the whole idea of ro is it strips everything out of the water
Yes I would still add dechlorinator to shop bought RO water (not as much needed as to treat neat tap water) you have no control over the production and as such you need to make it safer.
RO doesn’t strip everything you need to pass it through a last stage De-Ionisation filter to remove everything. If the TDS reads Zero then it’s as good as pure you are going to have and as such safer to use without dechlorinator.
Hi, Thank you both you have summarised both sides of my thoughts exactly! The RO has a TDS of 8 so there is something in there I just thought its a shame adding in water conditioner when you have paid for water with nothing in it. But I guess better safe than sorry approach is the way to go!
A TDS of 8 ppm out of the RO sounds be a bit high. I don't see a reason why it would hurt to add a bit of Prime to it, or if not let the water sit (perhaps with an airstone) for 24 hours if you suspect residual chlorine.Hi, Thank you both you have summarised both sides of my thoughts exactly! The RO has a TDS of 8 so there is something in there I just thought its a shame adding in water conditioner when you have paid for water with nothing in it. But I guess better safe than sorry approach is the way to go!
Yes that is correct... just doing the RO without DI typically yield a non-zero TDS. For instance, my current RO water is 2-3 ppm (my membrane is fairly new -- probably only made 600 US gallons with it so far) - When brand new the TDS is 1-2 ppm.
Interesting. I thought water pressure and temperature only affected production ratio and not the residual TDS.A TDS of 8ppm is perfectly normal for RO water that’s doesn’t pass though a (largely unnecessary) DI final stage.
RO membranes work on a percentage removal basis. So the output TDS is entirely dependent on the incoming TDS, so if you have a TDS on the incoming water supply of, say, 350ppm, and an output from the RO membrane of 8ppm, that’s a 97.7% efficiency, which is pretty good. The efficiency is also dependent on water temperature and pressure at the membrane, so efficiency drops at this time of year when the mains water is colder.
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