Total Disolved Solids

[sango]

What is a good ppm for TDS if your useing a ro filter?

 

[fishfreek]

RO filter only? I would say less than 15ppm. If your doing RO/DI than less than 5ppm.

 

[MT79]

It depends on the TDS of the water source. A properly functioning RO unit should decrease TDS by ten fold (or more). For example if your tap water has a TDS of 300, after the RO it should be 30 or less. A DI will take care of the rest and bring it to 0 TDS.

 

[sango]

Ahh ok. My tap water is a littl over 300 ppm and with the ro it is 21ppm. I called the company that made my ro filter and they said since it was less then a week old that the

 

[sango]

21 will drop some more. I was just worried becuase I thought it should be real close to 0ppm..

 

[MT79]

FWIW I just replaced my RO membrane (Kent TFC) and my tap is about 290, after the RO it was at 12. 21 TDS is acceptable for just RO, you can add a DI on fairly cheaply and very easily to get it down to ~0.

 

[seaham358]

IMO there is no way you are going to get 0 from just a ro unit with a start TDS of 300.
Do you mean ro/di unit? Now that should get you 0 or damn close to it.
And even if you have a low TDS that does not mean you will not have issues with your water, some things are not picked up with a TDS meter. And is the TDS good or bad TDS ? No way to tell.