RODI 15 TDS

[DiamondCoralsLLC]

hello, my tds coming out of my RODI 4 Stage BRS 75g per day is 13-15

but my tds coming out of my tap is 600.

is this fine to use in my tank.. i know reefers say it should be 0-1 but no matter how hard i try i can’t get it below 13

 

[KStatefan]

Something is not right then. You should be able to get to zero. What is the TDS coming out of the membrane?

 

[AJsReef]

How are you testing your water?

13-15 coming out of the RO stage would be expected around 98% rejection. If post DI stage you have TDS then a few things may have happened;

- DI resin is depleted and needs replacing
- You have channeling in your resin allowing the water to bypass
- Your RODI stages are not in the correct order

FWIW, at 600 TDS if you don't already have multiple DI stages it's worth looking into.