Tannin Macroporous Anion Resin - White Resin A2950 ( 8 lbs. minimum )
Added to regular softening resins to remove color from Tannic Acid in your well water supply.
8 - 13 lbs. of these "white" resins are normally required.

If your well water has a slight yellow or brown tint, the addition of one pound per inch in diameter of your resin tank will normally make the water clear.
If your water is darker, like Ice Tea, you may need as much as two pounds per inch in diameter of your resin tank.
While we have heard of using a separate tank just for this tannin resin, we have always added this resin directly into the tank on top of the regular resins in the water softener.
An Upper Distributor Screen/Basket is REQUIRED.

The "color" or "tannins" are checked by running the water at the well for a minute or two, and then taking a sample in a white cup or bucket, or clear glass, and IMMEDIATELY observing the "color" before the iron has time to react with the air ( oxygen ).
ONLY if you have Color when water is first drawn, would you "need" the extra Tannin removal resin in with your regular softening resins.