What is the active ingredient?

The ingredients are: Water, Proprietary Oxidant, Proprietary Surfactant, Proprietary Mineral Complex, Sodium Bicarbonate.

Does this product contain tannic acid ?

According to the product description on Amazon there isn't any. You could double check with company if its a serious issue for you. Good luck.

Does it have any sorts of smell/odor to it?

It has a bit of vinegar smell when it's sprayed, and then nothing. I have a fairly intense sense of smell, and I haven't noticed any residual odor to this product.

Weight	2.25 Pounds
Units	32.0 Ounce
Brand	The Ecology Works
Format	Spray

The Ecology Works - Anti-Allergen Solution 32 oz

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