Water question

[One fish]

If have two water sources. My bottled Ro water with a Tds of zero and my rodi water is reading 35, should I use the Ro water instead?
Thanks

 

[FraggledRock]

or change your RO or DI filter membranes =P

 

[alf1096]

Go with the lower tds. If your rodi is that high it's time for filters.