RO question - Aquarium Advice

ryshark · 10-24-2007, 02:59 AM

When adding fresh water to top off the tank does it matter if the water is just RO and not RO/DI? I just bought a RO unit but now I am wondering if I should have got RO/DI instead. Thanks for any advice.

Sadielynn · 10-24-2007, 08:16 AM

Some use just RO some use RO/DI and some use distilled (I use distilled ) you will want to test it for total disolved solids ect ....you can just use the RO to mix and top off as long as your tests read 0

ccCapt · 10-24-2007, 09:12 AM

Generally speaking, a RO unit will get the water down to about 5-20 ppm TDS depending on the TDS of the water to begin with. A DI cartridge will take that down to 0 ppm TDS. RO alone is definitely better than plain tap water, but you can just buy a DI cartridge and add it to your RO unit.

**roka64** · 10-24-2007, 10:36 AM

I agree, I use RO/DI.

10-24-2007, 02:59 AM	#1
ryshark Aquarium Advice FINatic Join Date: Jul 2007 Location: Southern California Posts: 567	RO question When adding fresh water to top off the tank does it matter if the water is just RO and not RO/DI? I just bought a RO unit but now I am wondering if I should have got RO/DI instead. Thanks for any advice.

10-24-2007, 08:16 AM	#2
Sadielynn Aquarium Advice Addict Join Date: Jul 2006 Posts: 1,256	Some use just RO some use RO/DI and some use distilled (I use distilled ) you will want to test it for total disolved solids ect ....you can just use the RO to mix and top off as long as your tests read 0 __________________ Sadielynn Nanoreefing site 2 nanos 10 gallons

10-24-2007, 09:12 AM	#3
ccCapt SW 10 & Over Community Mentor Join Date: Mar 2004 Location: Northeast PA Posts: 1,875 Images: 3	Generally speaking, a RO unit will get the water down to about 5-20 ppm TDS depending on the TDS of the water to begin with. A DI cartridge will take that down to 0 ppm TDS. RO alone is definitely better than plain tap water, but you can just buy a DI cartridge and add it to your RO unit. __________________ 125g reef See My Tank Info Check out The build project /Larry

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