Which is better for treating a chicken coop?

Harris. The 10.5 lb bag and included powder duster let you apply a light, even dusting across a coop, and it is OMRI Listed. The Earthworks 1 lb jar is too small for regular coop treatment.

Which is better for adding to pet or livestock feed?

Both are food grade and used as anti-caking agents. Earthworks states 89% silica and about 80 tablespoons per jar, which suits small feed batches. Harris is 100% freshwater diatomaceous earth with no additives and comes in a much larger bag.

Is the Harris bag worth the extra over the Earthworks jar?

If you need volume or an applicator, yes. Harris gives 10.5 lb plus a duster and OMRI listing. If you only need a small amount, the Earthworks 1 lb jar at $12.50 on 2026-11-01 is the cheaper way in.

Does either product expire?

Harris states it does not contain an expiration date. Earthworks does not state one. Keep either one dry and sealed, since moisture is the main thing that degrades diatomaceous earth powder.

Which has more silica?

Earthworks states 89% silica with the rest trace minerals. Harris states 100% ground freshwater diatomaceous earth with no additives or fillers but does not list a silica percentage.

Can I use either in an organic garden?

Harris is OMRI Listed for organic use, which is the clearer claim for organic growing. Earthworks is labeled organic and food grade but does not state an OMRI listing.

Earthworks Health Food Grade Diatomaceous Earth vs Harris Food Grade Diatomaceous Earth with Powder Duster

Buy the Earthworks 1 lb jar if you want a small, low-cost starter size for a family or a few pets and will use it mainly as an anti-caking agent or feed additive. Buy the Harris 10.5 lb bag with powder duster if you keep livestock, treat a barn, coop or garden, or want controlled dusting without pouring from a bag. The Earthworks 1 lb was $12.50 on 2026-11-01 and reached $21.25 on 2026-11-02; the Harris bag is a much larger quantity, so compare price per pound before deciding.

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