4 after RO and 0 after DI, would change DI after it gets up to 1. luckily i don't have a lot of CO2 dissolved in my tap water.
I just use a cheap tds meter i think it was $10
4 after RO and 0 after DI, would change DI after it gets up to 1. luckily i don't have a lot of CO2 dissolved in my tap water.
I just use a cheap tds meter i think it was $10
I also use a pair of dual TDS meters that look exactly like the HM Digital ones above. 4 stage RODI. Incoming water varies from 95-70. Post sediment and carbon is a couple of points lower. Post RO is typically 1 after the 2 min flush cycle finishes (usually starts around 50). Post DI is 0. As I’m lucky enough to have good quality incoming water I get good life out of all my filters - still working on the original RO and DI after nearly 3 years.
My tap water coming in usually runs around 120 and my Post RODI is always 0. I use HM Digital dual TDS meter also. Mine is a 6 stage with the last two being color changing DI Resin When the FIRST stage of the DI resin starts to change colors I change BOTH out with new Resin.
My TDS sits around 3 can't get it any lower than this though I have high TDS in the water where I live I only use the TDS meter that is on the Rodi unit itself and if it changes or moves off that 3 then I change out my DIresin
You guys have some awesome water sources. I live in a rural town west of Minneapolis and we have basically city treated well water. TDS straight from the tap is about 280. When we lived in a suburb of Minneapolis we had 80 straight from the tap and I would go through a single mixed bed resin in about 6-8 mos. Since moving to rural town I was going through a full size mixed bed resin in 6 weeks or less. I switched to the Cation, Anion & mixed bed resins and I go through Anion about 3.5 months the others haven't been changed in 8 months and are barely showing any color change.