H2S, carbon and air input needed

[MagKarl]

I have mild H2S in my water. Constant in both hot and cold. I originally bought an all in one iron softener with KDF, but you guys talked me out of the KDF. The softener is working great, but I do need to do something about the H2S.

I'm having trouble making the decision as to activated versus catalytic carbon, and whether or not I should get an air injection valve.

Obviously the catalytic carbon and the air injection are more expensive. Does the extra money get you significantly longer life or better performance?

I am also concerned with pressure drop with another tank, are the carbon tank service flow numbers based on the assumption of treating really nasty water, or based on flow impedance?

[Tom Sawyer]

I would go with GAC and a Fleck valve of your budget choice.

[royerm]

I would go with GAC and a Fleck valve of your budget choice.

Tom what is a GAC???? Thx

P.S I have a similar situation

[ditttohead]

Carbon (Granular Activated Carboc) service flow rates are based on removal of multiple chemicals including VOC THMs Chlorine, etc. The Carbon will flow much higher than the service flows but lower removal rates will occur. Chlorine removal rates will usually remain very high even at higher flow rates. For H2S, I would recommend a catalytic GAC, but many people use standard GAC with great success. You should not notice a flow reduction if you install a good quality and properly sized GAC. I would recommend at least a 1.5 cu. ft. or parger unit.

[Tom Sawyer]

Wiki says : Granulated Activated carbon, also called activated charcoal, activated coal, or carbo activatus, is a form of carbon processed to be riddled with small, low-volume pores that increase the surface area available for adsorption or chemical reactions.[1] Activated is sometimes substituted with active.

Due to its high degree of microporosity, just one gram of activated carbon has a surface area in excess of 500 m2, as determined by adsorption isotherms of carbon dioxide gas at room or 0.0 °C temperature. An activation level sufficient for useful application may be attained solely from high surface area; however, further chemical treatment often enhances adsorption properties.

[ditttohead]

Ill have to add that bit of information to my training seminars. I rarely go into it that technically during my training seminars, but that just sounds good!

Anyone attending the Pentair University in October? Word has it we may get to play with the EDI unit.

[MagKarl]

Seems the flow rate for carbon of either type is only about 2gpm/ft^3, so ~4gpm for a 2cf tank. What kind of service flow can I really get through a 2cf tank without a noticeable pressure drop? They say flows of 2-3x the specified service flow are possible. I plan to install this after my 1.5cf softener, so it's not going to be seeing any iron, just H2S.

Price for regular GAC looks to be ballpark about $100cf, catalytic about $200cf. Does the catalytic pencil out and last twice as long or subjectively work twice as well? Realistically, what should I expect for rebed frequency? I'm thinking maybe 3-4 years?