DI only water filtration - your opinion please

[LeBigDude]

Hi,

Does anyone have any experience of using DI only instead of RO/DI to purify their water?

I found the following unit online and I am very attracted to the idea of only 1 inlet / 1 outlet and no water waste...but I wonder if the water coming out of it would be good enough for a reef tank?

I have not looked at the cost though, but for my personal use this type of thing would be far more desirable than a RO/DI unit

Pure Water Exchange Systems VMB for High Quality Water from- Industrial Water Equipment ? Specialists in Reverse Osmosis, Water Softeners and Water Filters

Thanks for your help.

 

[soggytees]

Those are some really tall cylinders. Even so, if it is just a straight DI canister, I would think your resin would exhaust extremely fast. TDS coming out of DI should still be 0 I would think... Perhaps someone who's more knowledgeable than I am will step up and help us out.

 

[AZDesertRat]

RO acts as pretreament for DI and does 90-98% of the treatment so the DI resin lasts and performs as it should. There are things DI by itself is not very good at removing such as weakly ionized substances like nitrates, phosphates and especially silicates. I would never ever consider DI without RO. Resin replacements will get very very expensive in a hurry if you make much water at all. Remember the API Tap Water Filter which is pretty much the same thing on a smaller scale? It often lasts as little as 10-15 gallons per expensive refill so it in no way cost effective nor environmentally friendly due to all the spent resins taking up landfill space.