Calgary TDS readings?

[monza]

HO HO HO

What’s everybody getting for TDS numbers from our tap water?

I have a dual inline TDS unit that (1) is in line just after all the RO filters and just before the DI filter. The other (2) is just after the DI. The reading on the first one is always about 40-45. I change the DI when I notice the TDS higher then zero, anywhere from 2-10.

I seem to be going through lots of DI cartridges so just wondering if the RO unit is pulling out as much as it should be. Changing DI filters every three to four weeks. Sometimes more but I've been adding lots of water volume to my setup.

Thanks

Dave