RODI Manganese

[gguertin145]

Quick question for people... I have an RODI setup for my aquarium and just bought the tank to add drinking water after the RO.

My wife recently had a test done on our house water and the Manganese came back kinda high .18

Has anyone ever added a green sand filter to their RODI or is their an easier solution to target that?

 

[Reefing Madness]

 

[Randy Holmes-Farley Verified Community Expert]

0.18 in what units?

What exactly was tested? The Di effluent, or the source water before the RO/DI?

An RO/DI will remove manganese.

 

[Buckeye Hydro Verified Sponsor]

Manganese is troublesome... In commercial applications (typically) we remove it at the POE (point of entry), not at the point of use (POU).

Russ

 

[gguertin145]

Sorry the source water was tested not the rodi output. I have a well and wanted to add drinking water to my RODI but thought I could filter it either way for the tank or drinking water. The real question is what filter do I need to remove manganese?

Randy I have the well chemistry report but I have no idea what unit it is in? it says .18 and then has federal or state standard is .05s, .1h in bold.

Thanks!

 

[gguertin145]

So after reading that im sorry I think you already said that an rodi removes manganese... is that true?

For drinking water will just the ro remove manganese? I have 5 micron sediment, 5 micron carbon, 1 micron carbon, 75gpd ro, and the di. For drinking I was going to run an omnipure carbon block after the ro and have the di just for the tank. Will that safely remove the manganese for both drinking and the tank?

Thanks!

 

[Buckeye Hydro Verified Sponsor]

If you have manganese issues, typically you'll also have iron, and many times hydrogen sulfide in your well water. Feel free to email me your water analysis if you'd like me to take a look.

The EPA limit on Mn is 50 ppb = 0.050 ppm - so it looks like you have .18 ppm Mn. As little as 0.05 ppm will cause staining - typically brown/black, and give an off taste to the water.

I assume you want a POE treatment system? If so, please give us a call and we can get some additional info from you re your water use profile.

Russ

 

[Buckeye Hydro Verified Sponsor]

The Mn will likely foul the membrane, and it will stain your laundry and plumbing fixtures throughout the house.

 

[Buckeye Hydro Verified Sponsor]

"I have 5 micron sediment, 5 micron carbon, 1 micron carbon..."
You're forcing that 1 micron carbon block to trap sediment - not it's intended use.

Rule's of thumb re prefilters:

1. The pore size on any carbon block should be about the same as, or LARGER than the pore size on the sediment filter(s).
2. The concept of decreasing pore size on successive filters is a good one, but it applies ONLY to sediment filters. Once you get to the carbon blocks, place the block with the highest chlorine capacity closest to the sediment filter.

Russ