Please Help! Home RO unit modification

[Rookieofsalt]

Newbie need help on RO unit modification. Thank you all!

It is possible to convert this RO unit into a RODI? I really do not want to get another unit for the aquarium. Where would the DI resin housing be? before or after the 4th state?

Thank you

 

[wildman926]

After.

However, you want a tee and valves to go from the 4th stage to either faucet, or the DI unit to make water for your aquarium.

 

[Justdrew]

I would put the Tee before the 4th stage if it is a polishing carbon filter. Polishing carbon filters actually add TDS to the water after it leaves the RO unit. Not much, but I regulalry measure a rise of about 15-20 ppm after the polishing filter vs the straight RO water.

Later
Drew

 

[Rookieofsalt]

Yes. 4th stage is polishing carbon. I read alot about TDS, hobbist try to pull it down closer to zero as posible.

It helps alot ready both of the posts. GIve me some idea on what and how to do it.
Thank you both!