I can vouch for mark's suggestion that RO/DI isn't a whole lot better than plain RO. I have tested a number of filtering methods with my hand held TDS meter. Here are the results I saw. All of the tests below started with the same tap water.
Direct out of the tap (Centerville City Water) 310 PPM
Basic refrigerator drinking water filter 210 PPM
Brita drinking water filter 115 PPM
Basic RO system including the below 4 PPM
10 micron sediment filter
Carbon Block
Standard RO filter
RO/DI system including the below 1 PPM
10 micron sediment filter
carbon Block
Standard RO filter
Two DI canisters with new resin
So as you can see, the difference between my basic RO system and the RO/DI system is pretty negligible. The main reason for getting everything out of our water is to prevent algae growth, as many cities have a number of things that work like fertilizer and plant food in the water. But there are other things that are good to remove too (fluoride, chlorine, chlroramines, trace amounts of led, etc.) as none of these are good for coral growth. At 4 PPM though, none of these things are going to be a problem.
So if you really want to go over the top to have perfect water get the RO/DI filter, but I would say there is a 99% chance you won't notice any difference in the quality and health of your reef if you are using an RO only unit.
Edited by speyside712 - July 31 2017 at 9:54am
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