Do I need ro/di or just di??

[lennon]

Hi everyone. I know I should use ro/di water..BUT do I need both or just the one?
I know they sell both together but I wondered what the difference was. I am going to be connecting it to my washing machine line as to be able to use the waste water for doing wash instead.
Any advise is greatly appreciated

 

[bang guy]

DI would be fine but if your tap water isn't really clean it might be expensive. The beads in a DI will usually saturate very quickly using straight tapwater. The RO is used to remove 95-97% of the contaminants to save the DI beads. Think of the RO as the DI prefilter.

 

[lennon]

Originally Posted by Bang Guy
DI would be fine but if your tap water isn't really clean it might be expensive. The beads in a DI will usually saturate very quickly using straight tapwater. The RO is used to remove 95-97% of the contaminants to save the DI beads. Think of the RO as the DI prefilter.

Ok, sounds like both is the better solution. Any recommendations?
I looked some up in that auction site and saw some as low as $90..
Do I need to get reef...or just any ro/di machine?
thanks much!!

 

[bang guy]

They're all about the same. Make sure the RO has a sediment prefilter filter and a carbon filter at minumum. If you're getting a 100GPD or bigger doublecheck the RO membrane. Most of the faster membranes only filter about 90%. The 75gpd and lower usually filter a lot better. I use a Hi-S RO membrane that filters out more Silicate and Phosphate but the filters are slower.