Ona block,gel,liquid can be placed at the exit of the ducting,linen is just one of the flavours
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thats what I use..Good stuff. Although my filter is in the attic, and does an excellent job. I have a few jars around the house just to keep things smelling fresh...The Ona linen concentrate is mixed with some water, deepening how strong you want it. Then I use water retention crystals in a decorative jar...per the wife ..pour the Ona mix , let it expand. and recharge as needed.