Radon removal carbon specs

[nelsonr]

We have 3031 pCi/L radon in our water. It appears that's not an enormous amount, but it's not low either. I see references online about using a larger (10" wide) backwashable granular activated carbon filter to trap the radon and let it decay. It seems to me a regular 20" big blue activated carbon block filter should also work, but I'm not finding any information. Is there any resource showing the effectiveness of the two or is BB/block not recommended at all? Also, if carbon block works it would be useful to know what micron size I should get.

I should add we have very little sediment, there will be a 5 micron sediment filter before the carbon filter for our UV light (with the low sediment I don't expect it to clog quickly) and I'm targeting 15GPM.

 

[nelsonr]

I just found this site: http://waterquality.cce.cornell.edu/publications/CCEWQ-03-ActivatedCarbonWtrTrt.pdf On page 4 it says, "Point of entry without backwashing must be used." In that case I think carbon block would be much easier to replace than the media in a 10" wide tank, even though the tank is larger and would last longer.

 

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[Jadnashua]

The media may end up a low-level, radioactive waste. That can be problematic. While initial costs are higher, something like this can be more effective, and has less maintenance and consumables...

http://www.waterefining.com/radonaerator.html

More than one place makes similar devices, and what you ultimately do would depend somewhat on the levels involved and the volume of water you use. If you're not careful on a carbon filter, it 'fills' up, and just passes through water with high levels. Radon is probably worse coming into your shower where the spray creates a higher density where you can breath it in.