Ro/di

[apedroza]

Chris are you sure it's a 3 stage and not a 4stage??? Most 3 stage don't come with a DI unit. Are you missing a filter or carbon stage???

[Bill S]

I have/had a Coralife 3 stage - the DI is a cartridge that costs about 1/2 the cost of the unit - I replaced it with an add-on unit, and added a 3rd filter.

[BuckeyeHydro]

Well this weekend i bagged a good deal i got a three stage coralife RODI for 110 bucks brand new. i hooked it up and i tested my TDS and it came out to 40. is this acceptable i assume so since i tested the tap water and it read at 650.

As said above, if you indeed have an RODI system, 40 ppm after the DI is pretty bad.

If you have only an RO, with a likely configuration that looks like this: Stage 1= sediment filter, Stage 2= carbon filter, Stage 3= RO membrane, then you are seeing about 94% rejection from your membrane - not great, but not horrible.

Can you provide a pic of your system, or a model number/name?

Russ